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Thread: Filtering problems

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    Filtering problems

    I'm a new owner of an old pool so I'm very new to a lot of what goes on with running one.

    I went through the opening of the pool at the start of the season in May, which seemed to go okay but I noticed that I needed to vacuum the pool out again a lot quicker than I thought. I went on like this for a while then noticed that the inlet was throwing dirt back in to the pool and has been getting worse since. So I changed the sand, checked the laterals and replaced the spider gasket (which was extremely worn). Because I had to wait a while the pool didn't get pumped so it went green but I've been able to get that back to a cloudy blue.

    Unfortunately the pool is still not filtering correctly. I've just tried to vacuum it which started out fine but after a minute or so the pump began struggling and the pressure dropped. I turned it off then back on again and it threw everything back into the pool via the inlet and the pressure returned to normal. It may be worth noting that I had a problem priming the pump so I flushed out the skimmer pipe a few days ago and then it primed fine.

    Is there something else I should check?

    Many thanks,

    Nick
    10500 Gallon, 28ft x 14ft, in ground vinyl pool, tropical isle gas heater, midas multiport and I'll find out the rest!

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    Mod Squad kimkats's Avatar
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    Re: Filtering problems

    When you were putting the sand back in did you make sure you did NOT get ANY sand down the pipe? Did you fill up the filter 1/2 way with water before you put the sand in? Did you use GREAT care in putting the sand in?

    If you are not 100% sure of these questions you might want to check to make sure your filter does not have a cracked lateral or sand where it does not belong.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Mod Squad jblizzle's Avatar
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    Re: Filtering problems

    If the pool is green and you are trying to vacuum up live algae, it is not surprising that the pressure rose and the water flow slowed down because the filter was doing its job ... catching stuff in the water.

    You can NOT clean up a green pool with a filter as the algae will continue to grow. You need to follow the ShockLevelAndMAINTAIN Process to kill the algae faster than it can grow and then the filter can capture the dead algae.
    Jason, TFP Moderator
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    Re: Filtering problems

    +1 what jblizzle said. A filter will pick up the debris you send to it. In your case, it sounds like it is filling up and, when it can't hold anymore, it overflows and spits it back out.

    You should SLAM your pool and get it free of algae and your filter will go far longer without needing cleaning.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Filtering problems

    Thanks Kim. I covered over the pipe with tape, put water in before and put the sand in gradually. I watched some videos showing the process and copied that. If I get the time later in the week I'll empty the filter to double check the laterals.
    10500 Gallon, 28ft x 14ft, in ground vinyl pool, tropical isle gas heater, midas multiport and I'll find out the rest!

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    Re: Filtering problems

    Thanks jblizzle. The pool is no longer green, but cloudy I'm pretty sure everything is dead and I'm keeping it clear of leaves and other organic matter. When I tried to vacuum it yesterday the water pressure dropped, not rose. I think there may be a problem with the multi port and I've got unfiltered water leaking straight back to the water outlet to the pool, any idea how I could check that?

    Many thanks
    10500 Gallon, 28ft x 14ft, in ground vinyl pool, tropical isle gas heater, midas multiport and I'll find out the rest!

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    Mod Squad kimkats's Avatar
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    Re: Filtering problems

    Have you backwashed your filter?

    When you backwash you need to rinse before you put it back on filter.

    When you move your filter lever you should only move it in one direction. I go clockwise. This helps the gasket not get pinched or messed up.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: Filtering problems

    Hi Kim,

    I have regularly backwashed as needed and rinsed before returning to filtration.

    There is a lot of free play in the handle when you depress it before you feel the tension of the spring is that normal or does it point to the spring being defective?

    Nick
    10500 Gallon, 28ft x 14ft, in ground vinyl pool, tropical isle gas heater, midas multiport and I'll find out the rest!

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    Mod Squad kimkats's Avatar
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    Re: Filtering problems

    I am not sure. Sorry

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: Filtering problems

    Quote Originally Posted by UKnick View Post
    Hi Kim,

    I have regularly backwashed as needed and rinsed before returning to filtration.

    There is a lot of free play in the handle when you depress it before you feel the tension of the spring is that normal or does it point to the spring being defective?

    Nick
    Might have to replace the spring.
    My new spider gasket came with a new spring. (The old one was broken!!) I had the same problem
    Make sure the spider gasket is in the correct location, and the seal is in the right place.
    Good luck
    12500 AGP 2HP Sand filter
    Five years on BBB & loving it!

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    Re: Filtering problems

    I've just ordered a new multiport of the same model as it worked out only a few pounds more than buying the spring, washer and 'o' rings and I'll replace the whole top assembly and let you know how it gets on.
    10500 Gallon, 28ft x 14ft, in ground vinyl pool, tropical isle gas heater, midas multiport and I'll find out the rest!

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    Re: Filtering problems

    Quote Originally Posted by UKnick View Post
    Thanks jblizzle. The pool is no longer green, but cloudy I'm pretty sure everything is dead and I'm keeping it clear of leaves and other organic matter. When I tried to vacuum it yesterday the water pressure dropped, not rose. I think there may be a problem with the multi port and I've got unfiltered water leaking straight back to the water outlet to the pool, any idea how I could check that?

    Many thanks
    You can't guess with algae, how did you determine "everything is dead"?

    Quote Originally Posted by duraleigh View Post
    ......... You should SLAM your pool and get it free of algae and your filter will go far longer without needing cleaning.
    That's good advice right there!

    http://www.troublefreepool.com/conte...tain-shockingl

    Dom
    Dom - TFP Guide
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