Swimming Pool Design Tips
Here are some tips for the design of swimming pools to help water filtration and pool maintenance. Please be aware that these notes are for general guidance only and are not specific recommendations on behalf of Pool Maintenance Ltd
Over 40 years we have developed a detailed knowledge of all aspects of swimming pool design and we are happy to share with you some of our basic design considerations for the development of the specification for your pool.
Swimming Pool Circulating Systems
Freeboard Pool Circulation
In this type of pool, the top water level is below the surrounding deck. Water normally enters the pool through a selected number of wall inlets, and exits via outlet grids built into the deep end of the pool floor.
Efficient top water removal is essential in this design, as the majority of contaminants lie within the top 25mm. We deal with this by using a number of surface skimmer units spaced around the internal face of the pool tank. We calibrate them to remove at least 25% of the total hourly flow.
Level Deck Pool Circulation
In this pool design, the build up of contaminants is entirely eliminated as the water passes over the pool perimeter, falling into a channel covered by perforated grating. The water is then returned to the filter plant via a balance tank.
In any type of pool, the correct design of the water circulating system is of paramount importance to ensure that filtered sterile water is distributed evenly throughout the entire pool volume, eliminating any “dead” areas. Failure to do so will result in areas having little or no residual chlorine content and the strong possibility of increasing ammonia levels, with consequent growth of green algae.
Filter Speeds – Consider Running Costs
This is expressed as the volume of water in cubic metres passing through one square meter of filter area per hour (m3/m2/hour). A low filter rating will maintain a high water quality for longer periods before backwashing is required. Whilst small filters operating at a higher rating are initially cheaper to purchase, they will require washing at more frequent intervals than a filter of a lower rating.
As the water to wash the filters is taken from the actual swimming pool, this water loss has to be made up from the town’s water supply – which must be heated and chemically treated, with the consequent recurring costs involved.