Cartridge filters provide the simplest form of filtration. The pool water is simply passed through a very fine but durable material. To clean the filter cartridge you need to remove it from the filter and hose it down to shift the impregnated dirt. Occasionally the cartridge will need to be soaked overnight in a cartridge cleaning solution and then hosed clean and returned to the filter body. See our product CARTRIDGE FILTER CLEANER.
Sand is arguably the oldest form of filtration. These filters are called by many names - gravity sand, high rate sand, rapid sand and so on, but they all operate in the same way: dirty water is forced down through the sand and then clean water is removed at the bottom.
To clean this type of filter the flow of water is changed so that it now flows from the bottom towards the top - it begins backwashing. This process agitates the sand quite vigorously and as it is no longer under pressure the particles of dirt are easily dislodged from the sand.
It is necessary for the dislodged dirt to be sent somewhere other than back to the pool. Fortunately your backwash valve has already thought of this and will send it straight down the drain.
The cost of running a sand filter is minimal because the only item that normally needs replacing is the sand. You can get a Pool Service person to do this for you.
To help cleaning your sand filer use our product SAND FILTER CLEANER.
DIATOMACEOUS EARTH FILTERS:
The sparkle and shine that a pool can get if using a DE filter is superior to other types of filter. But there is a price. It must be well operated and maintained.
In a DE filter there is only filter material, usually dacron and nylon, which by itself could filter out only the largest particles of dust. However, when this is coated with a fine powder called DE powder. the powder does the job of filtering the water to a very fine clarity.
Never run your filter without any DE in it. Occasionally your filter will require a more thorough cleaning than backwashing. Every 12 months should suffice. To do this you dismantle the filter exposing the internals. Remove them, hose them soak them in acid bath overnight, hose them down again and replace. Re coat with DE powder. (An acid bath is a 10 parts water to 1 part LIQUID ACID.)