Dec
8
Knowing Your Swimming Pool Filter Types
Filed Under Equipment
Using the right swimming pool filter can make the difference between crystal clear fun and the foggy blues. The mistake that some people make is first, assuming that all filters work the same and second, using an inappropriate filter for their pool. This page will describe the different kinds of filters available and then explain how they work. You’ll soon discover that among your choices, your pool type is the determining factor in what makes a specific kind of filter most suitable.
Cartridge Filters
The cartridge swimming pool filter is the most popular choice among pool owners because it’s easy to maintain, change, and clean. These filters are all capable of catching particles as small as 6 microns (1 micron = 1 millionth of a meter) with a polyester or paper type material. Debris that enters this kind of filter latches on to a cartridge that can be hosed off and reused when dirty. Replacing the cartridge every year however, helps keep the pool cleaner and healthier all season. This type of filter is the most practical choice for private backyard swimming pools.
Diatomaceous Earth Filters
The diatomaceous earth filter catches debris with grids covered in a light coat of fossilized sea diatoms. To us, this coat looks like powder, but to tiny particles, it looks like rocks with very sharp edges. And it’s these edges that catch that debris passed this kind of filter. Unlike the cartridge filter above, the diatomaceous earth filter catches particles as small as 5 microns but unlike the high-rate sand filter below, it’s much smaller in size. It does however require frequent backwashing with as much as 500 gallons of water — a fact which may not be significant since it’s the preferred device for public swimming pools. Most home pools do not use this kind of filter. Do note however that since diatomaceous earth is considered hazardous waste, your community may regulate the way that it’s disposed.
High-Rate Sand Filters
The high-rate sand filter catches debris with a specific grade of sand. The tanks that hold this sand are made of fiberglass, stainless steel, or plastic, and the debris trapped by them can be as small as 5 microns — making them another preference for public swimming pools. Using a pressure system, the filter pushes debris deep into the sand before it sends its filtered product back into the pool. Frequent backwashing keeps the filtering system clean enough to work. And like with the diatomaceous earth filters, this task also requires large quantities of water.
