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Thread: Low water flow - help!

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    Low water flow - help!

    I'm a pool newbie. I've got a 12x20 above ground pool with a brand new 1hp pump & hayward plm100 cartridge filter with a brand new filter cartridge. I have almost no water flow when the filter cartridge is installed.
    My local pool company came out & told me I had to replace the pump & replace the filter cartridge, which I did, but with brand new parts I still have the same problem. I don't have much faith in the pool company anymore.
    Does anyone have any ideas why or what I can do to fix it? It worked perfectly when we closed the pool last fall.
    For what it's worth, the check valve in the bottom of the filter doesn't seem to work. Please help

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    Texas Splash's Avatar
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    Re: Low water flow - help!

    Hello and welcome to TFP! Well, two things come to mind in your situation - either a partial obstruction or an algae situation in which your filter is continuously getting clogged. Since it seems to be happening more when the cartridge is installed, I'm leaning more towards algae/organics in the water - even if it looks clear. Any chance you can provide us with a full set of test results?

    You do have me curious about that check valve though. Can you expand on why you think it doesn't seem to work? If you can maybe post a pic of your set-up or the location of that valve we'll see if it might be related to your problem.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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    Re: Low water flow - help!

    Thanks! I'll get pictures tomorrow. Should I try an Algaecide?

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    Mod Squad pooldv's Avatar
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    Re: Low water flow - help!

    I wouldn't.
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Re: Low water flow - help!

    Why not?

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    Mod Squad pooldv's Avatar
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    Re: Low water flow - help!

    Because many algaecides contain copper which will build up and stain hair, nails, water, plaster, vinyl and even dogs. The algaecides that don't contain copper don't kill algae they prevent it from growing in the first place. But, proper chlorine levels perform that function much better. It is important to maintain FC above minimum for your CYA at all times, FC/CYA Chart. When FC drops below minimum the kill rate for bacteria, viruses and pathogens is too low to effectively prevent person to person disease transmission, especially in kids. Another benefit of FC above minimum level is that it will prevent algae growth.
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    Re: Low water flow - help!

    Would you shock it then? Sorry, I'm at a complete loss

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    Mod Squad pooldv's Avatar
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    Re: Low water flow - help!

    No worries. We are here to help.

    What does your water look like?

    Do you have some test results?
    A test kit?

    Often a filter that clogs up quickly is because of an early stage algae bloom. Nothing clogs a filter faster than some algae.

    If you don't have a test kit then i recommend a TF-100 from http://www.tftestkits.com.
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    titleistseemore's Avatar
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    Re: Low water flow - help!

    Need to post a full set of test results, by doing so you will get better information on what your problem is and how to fix it. Shocking (SLAM) will remove the algae but that might not be your problem which would waste time and money on not fixing the problem. Getting pictures posted and test results posted will get you good and reliable help. The information you get here will be 100% accurate and keep your cost of maintaining your pool low.
    Tim Jacobsen Lodi Ca.
    18'x48" Intex Ultra Frame (5700 Gallons)
    TF 100 Test Kit, Speedstir, & Sample Sizer. Liquidator Installed.
    Hayward C550 Cartridge Filter (55 Sq. Ft.), 1HP Powerflo LX Pump, Pool Rover Jr.
    http://www.troublefreepool.com/threa...uild-Questions

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