From www.swimmingpoolsteve.com/pag... - There are three types of swimming pool filters to choose from - diatomaceous earth (DE) filters, cartridge filters and sand filters. Each one filters different sizes of debris and materials from the swimming pool water.
Sand filters remove the largest types of debris, 20-50 microns. Switching the sand media to glass media inside this filter allows for a finer debris removal from the water. A sand filter, though, has a multiport valve which is a major water flow restriction. This means the maximum flow rate (gallons per minute being filtered) is much less than other types of pool filters.
Cartridge filters remove smaller particles (10-15microns) than traditional sand filters resulting in cleaner water for swimming. They also do not have a flow inhibiting multiport valve making this a more efficient pool filter with a higher maximum flow rate - more pool water filtered faster.
Diatomaceous earth filters have the finest media that can remove extremely fine debris (2-5 microns), and that means well filtered swimming water. Although this is the one of the best mediums to use for filtering your pool water, working with DE and doing regular maintenance on DE filters can be more difficult than some pool owners care to take on.
Cartridge filters could be the best choice compared to DE filters and sand filters. The paper cartridges remove tiny debris, they are more flow efficient than the sand filters with a minimal and easier maintenance schedule than DE filters.
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