Choosing the Right Pool Filter

There are three different types of filters that are appropriate for swimming pools.  The water is drawn in through the skimmer by the pump, and is pushed into the filter, where it is cleaned and then pushed back into the pool.  The three filter options are: cartridge, diatomaceous earth (D.E), and sand.  Depending on the size of your pool and your other particular needs, please be sure to speak with your local pool dealer to choose which filter is best for you.  Below we will elaborate on the pros and cons of each type of filtration system.

Cartridge:

Cartridge filters are a type of paper filter that catches a very fine particle (10-20 microns).  In order to clean the cartridge filter, the pool owner must remove the filter from the tank and hose it off thoroughly in order to remove dirt and debris.  Unlike D.E. and sand filters, cartridge filters do not need to be backwashed, so this type of filter will conserve water best. 

D.E.:

A D.E. filter can filter out an even finer particle than cartridge filters are capable of (3-5 microns).  Since this type of filter is capable of filtering out such a fine particle, it is able to get your water the clearest and crispest that it can be.  D.E filters must be backwashed when the pressure inside the filter rises to about 8 psi over clean pressure.  D.E. filter media must be replaced after each backwash.  Since this filter can remove such a fine particle, it is likely to become dirty before a cartridge or sand filter would.    D.E. filters have a lot of components, and they should all be inspected after each backwash in order to keep the filter working properly.

Sand:

Sand filters can capture a particle between 20-40 microns and are the easiest and most efficient filtration system available.  Just like a D.E. filter, the sand filter must be backwashed when the pressure rises to 8 psi over clean pressure.  Sand only needs to be replaced every 3-5 years, and can be replaced with a finer media that will help filter a smaller particle out of the water, just as a D.E. filter would do.  

Have a conversation with your local pool professional to find out which filter type is best for your pool.