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SPN OCT 2010 Filters
www.swimmingpoolnews.co.uk
THE GOOD AND BAD NEWS ABOUT THE CHOICE OF FILTERS
SAND FILTERS
The pool water is pushed down through beds of sand inside the filtering tank. The sharp edges of the sand particles hold the impurities back, and pure water flows out from the bottom. However, as this process continues, more and more dirt accumulates in the filter. As a result, pressure increases on the filter and the flow of water reduces. When this happens, the filter needs to be cleaned through a process known as ‘backwashing’. In this process, water enters the filter from the bottom and exits from the top. This washes away the debris collected between the sand particles. The dirty water is removed from a separate waste line. This process should be repeated once every few weeks. In case the sand in the filter gets really dirty it can be easily replaced. The disadvantage of using a sand filter to clean pool water is that a lot of water from the swimming pool is lost and this water must be replaced. Moreover, this filter is not very efficient in removing debris from water as sand removes particles that are only 20 to 25 microns in size. Particles smaller than these are allowed to re-enter the water in the pool.
CARTRIDGE FILTERS
A cartridge filter is made of polyester, or any other material that acts as an excellent filtering surface. As water passes through these filters, impurities are caught and retained in them until they are cleaned. Cleaning these filters is easy. They may simply be washed with water from a hose pipe. Some even soak them in a detergent solution for sometime and then put them back in the pool. Although these are more expensive than sand filters, cartridge filters are popular due to the low maintenance required, and also because they can filter impurities as small as 5 to 10 microns.
ECO GLASS FILTERS
e new generation of filters will use crushed recycled glass. In extensive trials it has proved very effective in capturing debris to produce the highest water quality. It also has an exceptional long life and speed of performance. In trials the filter has been in operation for five years without needing to be replaced.
warranties of 10 years are not uncommon.” Tony continues: “Waterco’s objectives are that we supply to the absolute highest benchmark and that by continuous research and development we ensure that, not only, do we stay ahead of the competition, but that we provide products that are unmatched. Over the years we have seen many filter manufacturers come and go through variable combinations such as; lack of quality, customer support and or low operating margins. It is important that people opt for a filter, or any product for that matter, that is proven and from a trusted company who can support the product.” Waterco have expanded its commercial range with the introduction of the SMD and SMDD bobbin wound filters together with commercial
fibreglass split tanks, which are the perfect choice for installations where access may be problem. Another well known name is that of Aqua Sol Engineering whose V.V.F. Filters (Patented “Cyclonic” Action Media Filters) are aimed at the commercial market. The filters are an ideal choice for specifiers who are looking for better water quality and cost effective systems as the V.V.F. meets both criteria. The patented filter internals are the “biggest advancement in filtration technology for 50 years” as quoted by a renowned figure in the world filtration organisation. Conventional filters find it difficult to provide a 100% backwash cycle, as we all know this is a major problem for providing good water quality. The V.V.F. guarantees 100% backwash
ABOVE: Aqua Sol Engineering’s V.V.F. Filters (Patented “Cyclonic” Action Media Filters) are aimed at the commercial market
cycle without the aid of air scour, most conventional filter manufacturers maintain a filter which should have a sand media change every 2- 4 years, why? Because the media is becoming contaminated with body fats, hair and the usual debris of a swimming pool and therefore the filter has not functioned 100% for some time. The V.V.F. filter does not need sand changes as long as backwashes have been carried out in accordance and this dramatically reduces the cost of the filter over its life span.
V.V.F. are constructed in Grade 316 stainless steel and have PN 16 upvc internals to give adequate life span whereas conventional g.r.p. filters life span is 10-20 years.
As well as a wide range of pool filters such as the Aster sand filter and the energy efficient Atlas from the AstralPool Signature range, the company also boast an effective add on in the form of the Hydrospin pre-filter which assists standard pool filters in energy saving. The Hydrospin features 24 involute hydro cyclones in parallel and has a 40% extra capacity for solids with thickening/clarification. The system also
The Pollet Pool Group is convinced that they have a clear advantage with the patented Triton II Filters which feature ClearPro Technology®
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