Replace filter?

  • Last Post 10 June 2021
Odysseus posted this 03 June 2021

We have been in this house for 4 1/2 years. After the first summer, it was recommended (by Leslie's) that I replace the existing DE filter with a Jacuzzi J-CQ420 cartridge filter. I may have made a bad decision based on their advice that it would only need cleaning twice a year, but I now think that advice was purely to sell a cartridge system as it has needed cleaning a lot more often than that, and the cleaning is much more laborious than I expected it to be.

The cartridges are at the end of their life, so I need to consider buying new ones or replacing with a filter that can be backwashed, so I am seeking recommendations for either sand or DE for a 10k pool. Please kindly explain briefly why you make your recommendation.

many thanks

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JCMC70 posted this 03 June 2021

Hi Odysseus,

Sand filters filter particles down to about 20 microns. DE filters down to about 3-4 microns. So on the surface a DE filter will do a better job of filtering. But that's not the whole story. Some people add a filtering agent(like Fiber Clear) to the sand in a sand filter to help with filtering. The Fiber Clear site says that it will filter parts down to 3-4 microns. Some people enhance the effects of adding fiber clear by putting a filter sock on the skimmer basket. The skimmer sock catches all of the particles that would get through the holes in the skimmer basket and end up in the sand. If you add the fiber clear or some other filtering agent to the sand, you effectively get the same filtering capacity as a DE filter. Instead of using a product like fiber clear, some owners add a cup or two(depending on the size of the filter) of DE to the sand in the sand filter.
So for me it's a cost/benefit analysis. 

With a sand filter you have the cost of the filter, the cost of the sand, the cost of the skimmer socks (about $10 for a pack of 5), the cost of the filter enhancer (fiber is $12-$15 for a 9 oz bag that will get you about 4 cups). 
Some recommend that you replace the sand every 2-3 years. I just deep clean the sand at the beginning of every season and I think I've replaced my sand 3 times in 34 years. 

With a DE filter you have the cost of the filter and the cost for the DE. But every time you backwash the DE filter you have to replace the DE. 

Hope this helps

Odysseus posted this 07 June 2021

BTW, In case anyone has a rough idea of the cost of taking out an existing cartridge filter and replacing it with 1)DE and 2)sand for comparative purposes, that will be very helpful. Even if it is just "about the same", "one more expensive than the other by ?%", etc TIA

Service posted this 10 June 2021

Hi Odysseus,

The comparable sized DE filter to your Jacuzzi J-CQ420 cartridge filter would be this Waterway 48 Sq. Ft. DE Filter ($854) and you would require this 2" Waterway DE Filter Valve ($142)

The comparable sized Sand filter to your Jacuzzi J-CQ420 cartridge filter would be this Hayward S310T2 Sand Filter ($871) the valve is included.

You will have the cost of Sand and DE powder but this cost should be minimal. As JCM70 stated the sand should last 3-5 years where the DE powder your purchase more regularly but you should be familiar with this since you previously had a DE filter. I hope this helps. By the way, all of the items in this post are currently in stock ready to ship however our inventory has been selling quickly.

Thank You