Energy Loss of a Pool

I have found this graph an excellent tool to illustrate the expected energy loss of a constant depth pool based on standard summer parameters. However these parameters are variable day by day; humidity, the wind chill effect and the extent of moving water around the pool all have an effect on the heat loss and the increase or decrease of the heating demand of the pool.

For an example:

With outdoor air temperatures of 15 degrees a 10m x 5m pool covered for 20hrs/day will lose 150watts/m2/hr - 7.5kw/hr. This means that the pool requires 7.5kw/hr to maintain its set water temperature of 27 degrees. If you wanted to increase the pool temperature then you would need to provide <7.5kw/hr to move the temperature up.

What this graph especially highlights is the extent of heat lost when the pool remains uncovered. The same pool uncovered would lose 36kw/hr, which in most domestic applications means the heating source running constantly to try and maintain the temperature.

What we can learn from this?

·         Keeping the pool covered when not being used is very important

·         With new builds it is important to consider ground conditions when completing the dig. Dewatering the site will have a long term saving on the running costs.

·         Consider your pool use and length of season carefully before deciding on the correct heater to install. There is no point installing a heat pump with 15kw of output if you want to be swimming in a uncovered pool late in the season, where the heat loss is greater than the heat pumps output.

Spa BioFilm

Spa  Bio Film - The Basics

Is it time to deep clean your Spa? If you have done nothing to remove the biofilm or keep it from forming on your spa, then be assured you have biofilm on every surface, and it is very difficult to remove once it has formed. Despite best efforts to keep a spa clean, if not properly treated then over time biofilm will start to build up. This can be particularly prevalent in the pipe work, where the chlorine and spa chemicals have reduced exposure. Biofilm contains bacteria, dirt, mould and often viruses or parasites. It grows in the nooks and crannies within the plumbing systems and jets and forms a slippery film.  Why is it necessary to remove Biofilm? Even well maintained tubs will accumulate biofilm deposits and attract ‘nasties’. This build up provides a breeding ground of potentially dangerous organisms to your health. It will also reduce the performance of the spa as the pipe work and jets become restricted. A spa with immaculate plumbing results in cleaner, clearer, fresher water with better circulation. Don’t Panic! Firstly, Biofilm builds slowly in well maintained spas. We would recommend that during your usual emptying rotation a ‘spa and hot tub cleaner’ is used. This will remove oils and soap deposits and assist in reducing the build up of BioFilm. For a really deep clean, which should be done every 12-18 months depending on bather use, you should use a Bio Film eliminator (Chlorine Dioxide). This is a more aggressive and effective cleaner and the results are often startling when used on older spas. Your spa can react like this when treated with a Biofilm eliminator as the slime film and deposits are released from the pipe work, heater and pump internals. Once removed, the spa is then polished. Deep Clean Makeover for your Spa Cresta Leisure offers the following full treatment service: Prepare spa for deep clean Apply Bio Film Eliminator Where possible we will check inside the cabinet and inspect O-rings and tighten any unions Clean filter, wash down cabinet and cover, treating cover with a UV protector Empty and rinse Spa Polish Internal ShellRefill Balance and commission

New for 2013 - Poollock Manual Safety Cover

New for 2013 the V5 Manual safety cover will be exclusively available to Cresta. The V5M Poollock safety cover offers all the manufacturing quality and precision engineering that you would expect from Poollock, but by being a manual cover it can be supplied and installed at more affordable price.

The geared crank winding mechanism allows the cover to be easily retracted off the pool, with the running gear traveling through a track system positioned behind the copings.  The track can be recessed into the paving or fixed directly on top, with just a variation in installation cost.

By releasing the mechanism the cover can be then pulled back onto the pool by a leading edge and guy rope; as many manual solar covers are operated.

The cover is supplied with a dewatering submersible pump, this sits on top of the cover and pumps away any rain water that collects.

As sheet covers entirely encapsulate the pool you achieve a summer and winter cover in one, with the added reassurance of 100% safety. The cover material comes in a number of attractive colours and the UV protected  PVc coating.

Benefits

Safety – You and even the extended family can walk on it; so unattended children being left in the garden or around the pool are safe from drowning. Curious pets and wildlife are also safe.

Debris Free – Be running through a track the cover encapsulates the pool preventing debris being blown into the pool throughout the year. Less maintenance in the summer and a far easier and cleaner pool come the opening in the spring.

Chemical Saving – By blocking out the UV the cover reduces the chlorine breakdown in water by sunlight. You therefore reduce your chlorine consumption have less of a chance of a green pool at any time of the year.

Heat Conservation – The sheet cover dramatically reduces the wind chilling and evaporation effect that cools the water normally. The covers also reduce rain dilution of heat and chemicals, especially during the winter months.

Appearance – We can’t avoid the roller at the end of the pool, but we do think the cover is more attractive than a bubble cover. Due to the track mechanism there is also no need to install a winter cover and therefore the steel anchor pins and drilled holes in the paving can be avoided.

For further details visit http://www.poollock.com/pl089/v5-manual.php?G1=5&G2=5&G3=0 or contact Simon at Cresta Leisure simon@cresta-leisure.co.uk for more details or a quote.

Pool Closing Procedure

The following procedure should take a couple of hours, but will save DAYS at the start of next season.

This  procedure covers the main processes, however every pool is different so please consider the pool you're closing and the associated equipment.

• Clean solar cover and roll up. It is advisable to protect the cover from UV by either storing in a dry barn/garage or wrapping it in a solar protective sheet.
• Vac out all leaves and debris - left in the pool will rot down and stain the liner/grout or plaster finish. If the pool has a designated Vacuum point then we would recommend vaccing the pool too waste rather than filtration as this will reduce the pool levels at the same time.
• Backwash filter thoroughly to remove dirt which should not be allowed to overwinter in the filter
• Lower water level to 6-10" below the skimmer - ensure skimmer and vac valves are closed when reducing the levels.
• Shock dose with Calcium Hypochlorite or Sodium Hypochlorite - seeking <10ppm
• Adjust pH to 7.2-7.4 to maximise efficiency of shock chlorine
• Add winterising algicide
• Float weighted plastic drums/bottles in middle of pool. These act as a buffer should thick ice foams.
• Remove steps and skimmer baskets
• Fit winter debris cover (WDC). These are essential in reducing wind brown debris getting into the pool and reducing UV light breaking down the winterising chemicals.

• 

  Cris cross debris cover correctly installed

• Drain down filtration, heating and pipework systems. A number of customers are now protecting their heaters by insulating or wrapping them in a protective sheet
• Grease all exposed metal surfaces with petroleum jelly to prevent rusting
• Drain pump and spray with water repellent or store in dry location
• Open all valves above water level and close those below
• Switch off auto top up (if present)
• Switch off main electrical supply to pool equipment

We hope this procedure is of help. It is common for customers to ask their local pool business to complete this procedure for them.

Enclosures

With weather like this who would use or consider having a pool? One way to counter that would be to consider a enclosure. Here are a few reasons why it could be the answer to our dreadful summers.
 

Extension	A swimming pool cover extends considerably the period of use of the swimming pool, thanks to « the greenhouse effect ». The first sun’s rays of the spring will be then the signal for the start of a swimming season that will go until the last days of the autumn.

Protection	In addition to the increased temperature, the pool cover contributes to the quality of water.The swimming pool is protected from usual pollutions: dusts, plants, small animals, rainwater… It is the quality of your bathing water that will be greatly improved.

Safety

The cover ensures the control of access to the swimming pool for young children. It is a key part of the safety regulations require for the changes made to the law in France (law n° 2003-09 of January 3rd, 2003). Pool covers should always conform with standard NF P90-309. The pool cover once securely closed becomes inaccessible to young children.

The most affordable style of enclosure is the Abrisud low profile. The following website being an excellent source of information and illustrations.  http://www.aquaflex.co.uk/159/Abrisud_Pool_Enclosures.aspx

If you are after more living space then the Endless or Summit Enclosures are very popular.
http://www.summitleisure.co.uk/swimming-pool-enclosures.html
http://www.certikin.co.uk/enclosures.asp
Having been associated with both manufacturers we believe that these 2 enclosures are the best on the market.
This style of unit allows the client to retract the cover off the pool during those glorious English summer days, enjoying that true outdoor pool experience. However, when the weather turns wet and cold they can still get out and swim by pulling the enclosure shut, getting the best of both worlds.
The investment in an enclosure is always eye watering, however with the recent inclement weather and the ability to extend your swimming season more and more people are considering and installing them.

Filter Sand Changes

So how often and what should I use as a media?
In a domestic application with the correct flow rate and filter area, sand should and will last 6-8 years, especially if it is periodically receives a deep chemical clean often done as a service at the start of a season by your local pool company.
The easiest way to identify if the filter media needs changing is by the visual effect of they water, the speed it clarifies any water issues or to actually inspect the sand for a smoothness
The media polishes the water, removing organics, oils and greases. The sharper the sand the greater its filtering capacity. However, through water movement the media will be smoothed and the sharpness of the sand diminished; think of a beach and smooth pebbles. The effect of this reduces the medias ability of removing fine debris and organics.
Well balanced and filtered pool water should shimmer and almost shine, if its appearance is dull then the chemistry could be unbalanced or the sand is struggling to remove the fine suspended debris.
The touch test is a good way of identifying this; by shinning a touch into the pool at night and identifying tiny particles suspended in the water is an indicator that the media needs changing. As a temporary solution a flocculant can be used, which assists the filter in gathering these fine particles. However with continued dullness then a change in media should be considered.
Domestic filters are either 18" 24" or 32" in diameter and will hold aprox 100kg 150kg or 200kg of normally a silica 16/30 sand. The larger filter may have a shingle at the bottom of the filter to support the sand from crushing the filtering laterals, 'fingers' in the bottom of the filter.
Removing a filter lid is never easy. Having the correct tool/spanner always makes it easier, although even then some gentle persuasion will be needed. To reduce the water content then the drain valve at the bottom of the filter should be released.
The only way to remove the sand through the tight hatches is by using a cup or better still a wet and dry vacuum, that will suck the sand out. Either way it is a laborious task.
Once removed the laterals should be checked for damage and wear. They should twist or unscrew. Don't hesitate to replace if you have any concern, there is nothing worse than needing to replace them the following year as sand starts to enter the pool through a damage lateral.
Once emptied then you can recharge the filter with either silica sand, Zeoclear or glass. With top mount filters it is recommended to block the central delivery pipe to prevent media entering the pipe.
Sand is the most popular media and has been used since the year 'dot.'
Glass is very effective but does wear quickly (not as hard as sand).
Zeoclear is an excellent media at breaking down ammonias and therefore reduces the regularity of backwashing. It also has the added advantage of being able to be rejenervated by a saline wash every 24months, therefore not needing to be changed after the 6-8years. However, Zeoclear is more expensive, although with a domestic filter this is only marginal, especially when spread over the years.
Once charged, replace the filter lid and perhaps use a silica grease on the o ring for an effective seal.
Heavily rinse the sand before you return to filtration to prevent the dust of the media returning to the pool.
Depending on the size of the filter the task should take 2-4hrs and would cost aprox £200-£400 if a pool specialist were to complete the task.

Grand Designs Live

As Pool Contractors of the Year 2012 we have been invited by SPATA to showcase ourselves on their stand G29. In doing so we have been given some free tickets for anyone who cares to attend.
1st come 1st served.
Our focus will be promoting Cresta and our key suppliers products.In areas of the country we can't serve we'll be promoting other National Leisure Members.
http://www.granddesignslive.com/

Spa Problems - Who to turn to?

Sadly many gardens are becoming littered with spas that aren't working, due to the quality of build, lack of expertise and availability of spares. This is starting to taint the spa market, with customers being turned off by hearing about poor customer service and difficulties with the product.
The first precaution when considering buying a spa is to establish how reputable and established the spa company you are consider buying from is? There have been many 'spa specialists' that have come and gone over the recent years. As they go, the customers chances of getting back-up and problems resolved on the usual 5 year spa warranty is gone
Also, consider how long the company has been doing their promoted spa. Many businesses chop and change there spa supplier and with that comes the lack of technical knowledge and the capacity to hold the necessary spares to resolve any issues.
If you get a fault with the spa the first call must be to your originally supplier. They should have an obligation to fulfil the warranty commitment, promptly and efficiently. Failure to do so will only leave them in a poor light and you will be less likely to recommend them in the future.
If the supplier has gone bust, address it then with the manufacturer. Arctic Spas, Jacuzzi, Beachcomber and a few others are all established and trusted manufacturers and should be able to help, especially if the spa is still in warranty.
The last avenue is to contact a specialist spa technician company. Spa-Fix http://www.spafix.co.uk have become one of the strongest teams in the South, although they do come at a price.
Whatever you do, do your homework before you buy. Don't be left with large wooden box in the garden, that is only used as a pond! Trust me I've seen it before.

Liner Selection

This year our preferred supplier, Aquaflex (www.aquaflex.co.uk), have added an excellent addition to their website allowing you to configure your own pool liner; even filling it with water so you can get an impression of what it is like underwater!
http://www.renolit.com/ext/sp_konfigurator
As this is a link to their German suppliers, you will need to be careful in the liner descriptions to that of the UK market. However, they are all available so just check the description to their website.
If your water chemistry  has been good and the water temperature not too high then a 30 thou liner should last 10-12 years, although I've seen them as old as 18 years. Normally it is the corners that come away from the track or just the general appearance that forces the owner to consider changing the liner. This isn't however a major issue or even cost, considering the longevity and improvement a new liner will make to the enjoyment of the pool.
I will be adding more details about measuring your pool and installing a liner shortly. For the time being I hope you can have some fun selecting a colour/pattern and getting a feel on how the pool could be transformed!

Swimming Pool Safety

Just for interest - Check out the link below.
Quite amazing

http://www.youtube.com/watch?v=A78QiQ61oBM