There are three main types of swimming pool filter: Cartridge, sand, and diatomaceous earth. When choosing a filter, filtration performance and initial cost are important considerations. Maintenance effort and cost are also important. These are more difficult to know beforehand as they depend on how dirty the pool water is and the size of the filter relative to the size of the pool. The filter change numbers given below are based on manufacturer’s recommendations and user reviews and will vary depending on actual conditions. |
He filter should be washed or replaced, when the filter begins to be blocked by trapped dirt. This is determined by comparing either water flow-rate or filter water pressure, against the numbers when the filter was new. Details will be in the manufacturer's owner's manual. The filter should have a built-in pressure gauge. Cheaper cartridge filters do not have a pressure gauge. It's therefore necessary to eye-ball the cartridge condition, water flow-rate, or pool clarity.
Cartridge swimming pool filter these are the cheapest type of filter and are often supplied together with above ground pools. Advantages low initial cost. Easy to install and setup. Easy to maintain, just clean or replace the cartridge, but with daily or weekly effort. Medium filtration performance, Disadvantages Frequent filters washings and replacement required. Shops might not sell filters all year round, and the cost of replacement filters adds up.
Filters need to be manually hosed down for cleaning. There is no backwash setting. Special filter cleaning solutions are available for more thorough cleaning. Slow sand filters this traditional design of filter typically has a bed 1 to 2 meters deep, and can be rectangular or cylindrical in cross section; it is used primarily to treat surface water. Slow sand filters have a number of unique qualities: use biological processes and are non-pressurized systems. Do not require chemicals or electricity to operate.
Cleaning is traditionally by mechanical scraper; however, some operators use “wet harrowing”, where the sand is scraped while still under water, and the water used for cleaning is drained to waste. Maximum required throughput of water is achievable with one or more beds out of service. Require relatively low feed turbidity levels. Produce water at a slow, constant flow rate and are usually used in conjunction with a storage tank for peak usage.
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