Pool Design

Swimming Pool Design Tips

Filtration Ltd has 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 the specification for your pool.

Circulating systems

Water Park

Freeboard Type. 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. This is usually overcome by the use of a number of surface skimmer units spaced around the internal face of the pool tank. They are calculated to remove at least 25% of the total hourly flow.

Level deck type. In this pool design, the build up of contaminants is entirely eliminated as the water passes over the pool perimeter, falls into a channel covered by perforated grating, the water being returned to the filter plant, usually 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

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.

Filtration’s Auto Top Up System

The Auto Top Up System was developed by Filtration Ltd in the early 1980’s. It is an extremely reliable auto system used to maintain the required water levels in the pool at all times; re-instating the water levels following filter backwash, The original installation of this system, like all of its successors, continues to function effectively and fault free today.

Even with the most effective auto or semi auto system, we strongly recommend that the water treatment system is manually verified on a planned, regular basis.

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Hygiene & Safety for Level Deck & Free Board Pools & Spa Baths