These use sand as a filtering agent. The sand withholds dirt particles and prevents their re-entry into the pool. Sand filters provide a good cost-performance balance and require no maintenance, other than periodic cleaning, which can be performed either manually or automatically (manual or automatic selector valve). An increasingly popular alternative to sand is provided by glass filter media, more efficient and environmentally-friendly.
Pools
Circulation and filtration
Filtration systems
The filtration system is a fundamental component of your pool, ensuring the water is kept clean and free of large-size debris as well as dirt particles invisible to the naked eye. A properly functioning filter allows you to reduce significantly the use of chemical products for disinfecting the water.
Filters are of different types according to the type of filtration method used.
Water filtration pumps
Filtration pumps are the heart of the pool’s circulation system. They convey the water to the filter and reintroduce the clean, filtered water back into the pool. Without a pump, the pool's water would stagnate, becoming green and murky in just a few days.
The choice of pump is therefore essential to keep the pool water clear and pure: the filtration pump must be sized to match the pool’s size, ensuring that the full volume of water is thoroughly filtered within a few hours.
Pumps are available in thermoplastic material (three-phase or single-phase), in cast iron, in marine bronze without pre-filter, to be used with steel pre-filters. Our technicians are available to assist you in the choice of the pump system best suited for your pool, describing the features of the various pump types available.
Sand filters
Mineral bed filters (quartz sand, vitreous granules)
Mineral bed filters are the most widespread type in use, and offer an excellent cost-performance ratio, simple maintenance, long life and strength. While more expensive, filtering beds composed of glass particles are also increasingly used: their cleaning requires less water and reduces even more the use of chemical products.
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Diatomaceous earth (DE) filtration
DE filters are very effective: they are able to capture particles down to a few microns and thus produce perfectly clean water, minimising the amount of chemicals necessary for disinfecting. DE is obtained from diatoms, which are the fossilized silica skeletons of unicellular algae forming large deposits. DE requires periodic replacing; this is why sand filters are often preferred.
Cartridge filters
These filtration units systems a very simple hydraulic circuit: filtration takes place by means of a cylindrical cartridge with a cellulose and polyamide base. Cartridge filters are very affordable and provide good filtering, but they quickly become dirty and need to be cleaned or replaced frequently.
Multilayer filters
Multilayer filters comprise several layers of different filtering minerals, each with different particle sizes and different specific weights, arranged with decreasing grain size from top to bottom. Impurities are thus retained progressively by the filtering beds, whose arrangement ensures that the larger particles do not obstruct the surface of the filter. This system also provides excellent spontaneous flocculation, which allows removal of turbidity and suspended solids, which hinder water disinfection. This feature removes the need for chemical products for flocculation.
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