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Thread: Filter replacement options

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    RecurveArcher's Avatar
    Join Date
    Jun 2016
    Noblesville, IN

    Filter replacement options

    Filter replacement options

    We purchased the house this winter; the pool was closed by a local company who cleaned the filters; upon opening the pool this year the PSI was at 12. I spent 3 hours yesterday cleaning the filters (hose with regular spray nozzle) for the first time after the PSI reached 23, and after putting them back in the PSI only dropped to 16. They could probably be improved with the overnight soaking, but theyíre looking pretty worn overall and so Iím looking to replace them after the end of the season.

    I found replacement filters for about $430, but am considering switching to sand or DE; leaning toward sand if I do switch. Iím trying to figure long-term cost and canít seem to find clear data on how often DE needs to be cleaned/replaced and how often the grids would likely need to be replaced (and the cost to do so). It looks like sand lasts about the same amount of time as cartridges, if not longer, and is $30-$50 to replace vs. $400+ for cartridges, so definitely cheaper long-term.

    I found some sand filter calculations, and at about 40K gallon Iím looking at 83 GPM or a 5.5 sq ft filter. I looked around a bit and I think maybe the Hayward S310T2 at just over $600 might fit the bill. Does that sound right? Any other recommendations?

    Pool and equipment specs are in my signature, but for some additional info, the main drain and one skimmer are sealed, so there are only two working skimmers and 3 jets. We have a robot vacuum that I run 2-3 times per week, which is probably more than is needed because we have an auto-cover that stays closed when not in use, so overall the pool stays pretty clean. Currently use chlorine tablets but will switch to bleach once I run out of the original stockpile (before the end of the season). Strongly considering adding a SWG, but will do some kind of automation if not. Will likely replace the pump with variable speed, but not until the current pump dies (and it seems to be working fine); we run the pump 24/7.

    My main reservation about a sand filter is the filtering capability. I really like the pool to be crystal clear and sand only gets down to 20-40 microns, but if the human eye can only see as small as 50, how much does it matter? I also understand youíre losing water with the backwash, but about how much (in terms of gallons)? We have well, so I do fill using the hose-attached filters, so thereíd be some extra cost to purchase those for the fill water.

    Thoughts or suggestions?
    40 y/o IG L-Shaped Clayton & Lambert Diving Pool, 40K gal, SS walls, gunite floors, & auto cover
    Sta-Rite S8M150 450 sqft 125 GPM Cartridge Filter, Sta-Rite PHK2RA6E-102L 1 HP Pump
    Pentair MiniMax NT 250 DV 250K BTU Heater, Filled w/ filtered well & testing w/ TF-100

  2. Back To Top    #2

    Join Date
    Jan 2015
    Anthem, AZ

    Re: Filter replacement options

    I've been down your road before. I switched cartridge filter to sand, and then bought a new home with DE and tried to switch it to cartridge. Honestly I think cartridge is about the easiest. Sand you're always dragging a hose out and backwashing gallons somewhere, draining the pool, and having to refill what you poured out. I used Zeosand which is supposedly a better cleaning agent than sand, but didn't notice much difference. DE filter was a nightmare as you backwash hundreds of gallons, and then have to buy DE and cartridges anyway.

    In the end with my latest house its a cartridge and I think I'll keep it. Soak the filters and spray them often, and you're set for years. I think you could get just as long out of cartridges as you can with sand if you did it carefully.
    19K IG Pebbletec with attached spa. 60sqft Cartridge filter, Intelliflow VS, 399k BTU Gas Heater, Pentair IC40. Phoenix, AZ, full sun.

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