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Thread: Losing sand from my sand filter. Water is scummy on top...

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    Losing sand from my sand filter. Water is scummy on top...

    Hey guys! I posted before with this, but I was in the middle of dealing with winter algae. Now that that is cleared up, I wanted to start fresh with a new post.

    So, I have 2 problems. A short term problem is that there is scum on the top of my pool. It's stuff that I can't fish out of the pool and my filter is apparently not getting it out. It could just be pollen (I live in Chattanooga, TN), but it's still annoying.

    A long term problem, which I'm wondering if it's causing my short-term problem, is that I'm losing sand from my sand filter. It's been happening since I bought the house. I've been running it since last April or so when we got new sand put in it. It's been losing a little sand ever since then. Personally, I think that I'm running low on sand now and that's why there is scum on top of my pool. What do you guys think?

    EXTRAS:
    I'm attaching pictures of the top of my pool so you can see the scuminess that I'm referring to.

    [attachment=1:2wn5hjv7]pool-1a.JPG[/attachment:2wn5hjv7]
    [attachment=0:2wn5hjv7]pool-2a.jpeg[/attachment:2wn5hjv7]
    Attached Images Attached Images
    -15,000 gallon vinyl liner in-ground pool
    -Pentair 1HP SuperFlo pump
    -Hayward Pro Series sand filter

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    Isaac-1's Avatar
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    May 2010
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    Re: Losing sand from my sand filter. Water is scummy on top

    Sand loss is most likely a broken latteral in the filter or possibly a bad spider gasket in the multi port valve, you can use the forum search for detailed posts on how to fix these. As to the stuff that is floating it would help if you can post a full set of test numbers preferably done with one of the suggested test kits in pool school, personally I use the TF-100 as it is a better value than the K-2006 since you get more of the reagents you use the most.

    Ike
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
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    Re: Losing sand from my sand filter. Water is scummy on top

    Hi! I don't have my numbers, but all of my tests have been within acceptable ranges for a pool of my type. I use the k-2006 test kit.
    -15,000 gallon vinyl liner in-ground pool
    -Pentair 1HP SuperFlo pump
    -Hayward Pro Series sand filter

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    Smykowski's Avatar
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    Sep 2011
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    Gurnee, IL (North Suburban Chi-town)
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    Re: Losing sand from my sand filter. Water is scummy on top

    The stuff on the top looks like it's normal dirt/debris, although the reflections make it hard to tell in the picture.

    Sand in the pool is one of a couple things. Bad o-ring on the multiport, bad spider gasket on the multiport, broken lateral, improperly seated lateral. The spider gaskets on the Hayward filters aren't designed to be replaced, you're supposed to buy a whole new valve; that said, I have heard of people carefully scraping off the original gasket and gluing a new one in place.

    You're basically going to have to take the filter apart and inspect everything. I'd start with the laterals - if they're not seated properly, it's a real easy fix. If they're broken, it's only slightly harder, and they're cheap parts.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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    Re: Losing sand from my sand filter. Water is scummy on top

    So, if I have to take my filter apart to see what it is, does that mean my pool will be without a filter and without circulation for a few days? Or however long it takes to get the new part in?
    -15,000 gallon vinyl liner in-ground pool
    -Pentair 1HP SuperFlo pump
    -Hayward Pro Series sand filter

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    Smykowski's Avatar
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    Sep 2011
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    Gurnee, IL (North Suburban Chi-town)
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    Re: Losing sand from my sand filter. Water is scummy on top

    Taking it apart to inspect then putting it back together is a couple hours, tops. How long it's down depends on what parts you need and how long it takes to get a hold of them. Take the multiport valve apart to inspect the gasket (lots of videos on youtube) and remove the sand (shop vac or garden shovel) to get to the laterals. Be gentle! Also, inspect the standpipe (center pipe)itself for cracks. After you get it looked at, you should have a good idea of the next step.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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