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Thread: Sand Filter

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    Sand Filter

    I have a 2 year old Pentair SD 80 sand filter that is leaking somewhere out of the bottom. I can't see exactly where because the stand that it sits on is in the way. There are only two openings on this unit. The drain at the bottom and the opening at the top for the multi-port valve. The water is not coming from either of these. To add to the mystery, at times it appears as a steady stream (not a river, but definitely steady) and then at other times I don't see any water at all! Has anybody else experienced anything similar to this?

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    tjwaggoner's Avatar
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    Re: Sand Filter

    I have the same filter and recently got a good look at the bottom while dumping and refilling with new sand and I can also say with confidence that there isnt any opening. It is a solid molded plastic tank but the shape of it would allow anything leaking around the multi port valve to run down the curve of the tank and come off right at the bottom making it appear as if its leaking from the bottom. Could this be what is happening in your case perhaps?
    10,000gal fiberglass kidney
    3/4 hp whisperflo
    Sand dollar SD80
    IC40 SWCG
    (2) PAL2000 multi colored LED lights
    all 2" plumbing
    no water features/no spa
    TF Testkit

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    Re: Sand Filter

    Although I'm not really a leak finding expert. I'd suggest double (or triple) checking the drain cap for leaks. Also the air release, pressure gauge and the likes. A steady stream of water could very well be a hairline crack, but I've never experienced one first hand so I can't say for sure. Check carefully using a flashlight and go slowly.
    69,000 Gal gunite indoor IG pool.
    5 HP Emerson - Pentair Triton II Commercial TR140c Sand Filter x2
    5,000 Gal gunite outdoor IG hot tub
    2 HP Sta-Rite - Pentair Triton II Commercial TR140c Sand Filter

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    Re: Sand Filter

    Thank you for your suggestions. I felt every square inch above the base, especially around the valve, drain and all connecting lines, and my hands were completely dry. Yet, water was still coming from underneath the base. Ugh!! Going to dismantle this weekend.
    Any suggestions on a replacement? Have been told that filter is "commercial" equipment and way more than I need.

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    Mod Squad Bama Rambler's Avatar
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    Re: Sand Filter

    I doubt that it's way more than you need but without knowing your pool and pump size there's no way for us to tell.

    As a side note, the SD-80 isn't a commercial sized filter. In fact it isn't even a very large filter.

    If you like the sand filter I'd stick with the SD-80 as the new one will plumb right into place and you can keep the parts (multiport, drain assy, laterals, etc) as spare parts. Or maybe you could just buy a new vessel and reuse those parts.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    duraleigh's Avatar
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    Re: Sand Filter

    Have been told that filter is "commercial" equipment and way more than I need.
    It's pretty hard to get "way more than you need" in a filter. If your clean pressure is roughly 8psi or more, that's a fine filter for your pool.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Sand Filter

    I'm getting one heck of an education on filters, that's for sure! Here's my stats:
    14x29x4' avg depth IG fiberglass
    Hayward heater 200m Btu I think!
    IC20 SWGl
    SD 80- the leaker

    Pentair superflo pump. Not sure of hp.

    1.5" piping

    Installed summer of 2008.

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    Mod Squad Bama Rambler's Avatar
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    Re: Sand Filter

    Figuring that your pool is about 11,000 gallons, that filter isn't too big at all. In fact I'd say it's just right.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Sand Filter

    Tony B, I have the exact same filter, and the exact same leak. (As yours, it was installed in summer 2008. Hmmm...). And yes, I have checked very carefully that it's not coming from any other opening, but is spurting up from below the black base. Have you found the cause of your problem? I am having my local pool tech to come out and look at it next week, but I'm worried it will end up being a crack and need replacing. The person I spoke to while scheduling indicated there was a plug and seal on the bottom center (not the drain plug) but tjwaggoner indicates there is nothing else down there. What have you found?

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    Re: Sand Filter

    Preifsny, Unfortunately, I do not have very good news for you. I took my system apart and flipped over the tank. There was a hairline crack in the seam. I thought these were a 1 piece mold but they are not. There is not any type of drain plug on the very bottom. If this is what your local pool store is telling you, you might want to find someone with more experience with Sand Dollar products. Of course the manufacturer's warranty is one year and my filter was two years old. My (ex)pool guy who sold it to me said that was too bad and offered to take 5% off of a new filter. What a guy! I bought one on line (Global Industrial) for half of what he wanted and installed it myself. Hand saw, PVC glue, and a 6-pack of beer! Piece of cake.

  11. Back To Top    #11

    Re: Sand Filter

    tonyb, thanks for your reply.
    I ordered a new filter online, and finally got around to tearing apart my old system. On cleaning and inspection, I found 2 cracks along the bottom seam. At first I thought they were dirt or stain, but on closer inspection I realized how severe they were. I'd call them more than 'hairline'. Each probably 4" long by 1/4" wide. Only a tiny pinhole leaking at this point, but it looks like they were getting ready to blow out. Pics posted on flickr. I replaced with the same filter (definition of insanity) so that I wouldn't have to mess too much with the plumbing. Hope the results are different. Check back in 4 years....

    http://www.flickr.com/photos/paul_reifs ... 804584094/

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