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Thread: Pump pressure goes up very quickly even after backwashing

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    Pump pressure goes up very quickly even after backwashing

    I'm a new owner of an in-ground pool and have only basic experience with an above ground pool, and I have an issue with my in-ground pool pump pressure.

    While running, the pressure will be about 20PSI but when I turn the pump off for 2-3 seconds and back on the pressure drops to about 10PSI, but after 10-15mins the pressure is back up to 20PSI.

    I've tried several backwash attempts. I switched from a 300LB sand filter to DE filter, no difference. I connected a hose from the filter outlet directly to the pool by-passing the pool piping. Still no difference. When I view through the clear plastic lid on the pump filter I can see the water flowing but that area isn't full of water when the pressure is high, but if I turn it off and back on it gets full and the pressure is low. So it appears the pressure goes up when less water is flowing, but I'm not sure why that would happen.

    The pool is 20x40, any ideas or suggestions would be greatly appreciated.

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    Mod Squad Bama Rambler's Avatar
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    Re: Pump pressure goes up very quickly even after backwashin

    What does the water look like?

    If you have algae it will do exactly what you're describing.
    Dave J. TFP Moderator
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    ultra800_96's Avatar
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    Re: Pump pressure goes up very quickly even after backwashin

    Do you have a "recirculate" setting on your valve? Try that & how does it behave then?
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    Re: Pump pressure goes up very quickly even after backwashin

    Quote Originally Posted by Bama Rambler
    What does the water look like?

    If you have algae it will do exactly what you're describing.

    I have been fighting the algae for 7-8 days now, I finally got the water cleared up and can see the bottom. There is a brownish/greenish hazy cloudy stuff right on the bottom that I've been trying to get vacuumed up but as soon as I get near it it disperses. Is this algae or some some mucky dirty water? Should I just keep vacuuming it and then backwash it again?

    Here is what it looks like:
    [attachment=0:104c8j08]3.jpg[/attachment:104c8j08]
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    • File Type: jpg 3.jpg (102.3 KB, 283 views)

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    Mod Squad Bama Rambler's Avatar
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    Re: Pump pressure goes up very quickly even after backwashin

    Once you get all the algae killed things will start getting better.

    You have been recharging the DE filter with DE after backwashing haven't you?

    On a diifferent but related note. Are you holding the FC at shock level for your CYA as often as once an hour? If not you need to be. Also, if you'll post a full set of test results and how you got them, we'll help you get rid of the algea. remember, shock is a process not some product you buy.

    What all have you put in the pool?
    What product are you using to maintain shock level in the pool?
    Dave J. TFP Moderator
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    Re: Pump pressure goes up very quickly even after backwashin

    Quote Originally Posted by Bama Rambler
    Once you get all the algea killed things will start getting better.

    You have been recharging the DE filter with DE after backwashing haven't you?

    On a diifferent but related note. Are you holding the FC at shock level for your CYA as often as once an hour? If not you need to be. Also, if you'll post a full set of test results and how you got them, we'll help you get rid of the algea. remember, shock is a process not some product you buy.

    What all have you put in the pool?
    What product are you using to maintain shock level in the pool?
    I followed this process to kill off the algae -> turning-your-green-swamp-back-into-a-sparkling-oasis-t4147.html

    It worked really well, it took A LOT of chlorine (9 gallons of bleach and lots and lots of chlorine granules) to get FC to shock level and I've been pretty diligent at keeping it up high, it did slip into the mid level when I checked it one morning, but I've been keeping it really high while working on killing the algae. I've also used a bottle and half of the algaside chemical as well.

    I always replaced the DE after each back-washing. Unfortunately I had to take the DE filter apart after each back-washing to clean it really well, which is a real pain in the neck. Shaking the handle like the instructions on the DE filter does not shake off all the junk.

    It used to look like this:
    [attachment=1:1dstls7i]IMG_2392.JPG[/attachment:1dstls7i]

    This is what the DE filter looks like after the pressure hits 20 PSI:
    [attachment=0:1dstls7i]IMG_2407.JPG[/attachment:1dstls7i]
    Attached Images Attached Images

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    Re: Pump pressure goes up very quickly even after backwashin

    Quote Originally Posted by ultra800_96
    Do you have a "recirculate" setting on your valve? Try that & how does it behave then?
    Good suggestion, I do have that setting and will give it a try.

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    Mod Squad Bama Rambler's Avatar
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    Re: Pump pressure goes up very quickly even after backwashin

    You followed the right plan!

    What were those chlorine 'granules'?
    Did you raise the shock level as you added them if they were Dichlor or Trichlor?
    What algaecide did you use?

    That's an awfully small filter for that size pool. I'd consider going back to the 300# sand filter if I were you.
    Dave J. TFP Moderator
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    Re: Pump pressure goes up very quickly even after backwashin

    Quote Originally Posted by Bama Rambler
    You followed the right plan!

    What were those chlorine 'granules'?
    Did you raise the shock level as you added them if they were Dichlor or Trichlor?
    What algaecide did you use?

    That's an awfully small filter for that size pool. I'd consider going back to the 300# sand filter if I were you.
    I switched back to my 300# sand filter after the laborious chore of cleaning the DE filter so frequently. Today I just vacuumed the remaining crude on the bottom straight out on the waste setting, then put the automatic pool cleaner (Kreepy Krauly) back in to get the smaller stuff, and it ran for about 3 hours before the pressure was at 22 PSI and I back-washed it again.

    Here are the pictures of the chemicals I'm using. I don't see Dichlor or Trichlor on ingredients list.
    [attachment=1:c0sjy1hz]IMG_2438.JPG[/attachment:c0sjy1hz]
    [attachment=1:c0sjy1hz]IMG_2439.JPG[/attachment:c0sjy1hz]
    Attached Images Attached Images

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    Mod Squad Bama Rambler's Avatar
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    Re: Pump pressure goes up very quickly even after backwashin

    What test kit do you have?

    At least you used polyquat 60. You should have used that money buying bleach but that's water in the skimmer now.
    You didn't hurt anything by adding it and it may help a little.

    I can't say that for the Cal-hypo. It is raising your CH each time you add it and I noticed it's only 48% so it's not even the good stuff.

    I'd stick to bleach from now on until you get it clear.
    Can you post a full set of test results?
    Dave J. TFP Moderator
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    Re: Pump pressure goes up very quickly even after backwashin

    Quote Originally Posted by Bama Rambler
    What test kit do you have?

    At least you used polyquat 60. You should have used that money buying bleach but that's water in the skimmer now.
    You didn't hurt anything by adding it and it may help a little.

    I can't say that for the Cal-hypo. It is raising your CH each time you add it and I noticed it's only 48% so it's not even the good stuff.

    I'd stick to bleach from now on until you get it clear.
    Can you post a full set of test results?
    I'm using AquaCheck Select test strips from Leslie's Pool Supply. I found out that the old strips don't work right, fresh strips are important.

    Here is the test result from this morning.
    [attachment=0:33p6sd1v]IMG_2440.JPG[/attachment:33p6sd1v]
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    Mod Squad Bama Rambler's Avatar
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    Re: Pump pressure goes up very quickly even after backwashin

    Throw those strips away and do yourself a favor and get a good drop based test kit. You'll wonder why you waited so long once you do. You'll also realize just how bad those strips really are.
    Dave J. TFP Moderator
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    XsAllOverIt's Avatar
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    Re: Pump pressure goes up very quickly even after backwashin

    Spend the money and buy a test kit. After your pool is cleared up, you'll be extremely happy to see the results stay consistent throughout the season. Worth the investment.
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    Re: Pump pressure goes up very quickly even after backwashin

    Quote Originally Posted by Bama Rambler
    Throw those strips away and do yourself a favor and get a good drop based test kit. You'll wonder why you waited so long once you do. You'll also realize just how bad those strips really are.
    I found the TroubleFreePool.com recommended test kit on tftestkits.net and just ordered the Taylor K-2006. I'm hoping this works better.

    In the meantime I've been manually vacuuming the crude on the bottom using the 'waste' setting so it doesn't go into the filter. I keep brushing the sides and floor into one side of the pool and let it settle and vacuum it out, seems to be working but it's tedious. Still a bit cloudy though, so I just added some clarity stuff that is supposed to help with the cloudiness.

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    Mod Squad Bama Rambler's Avatar
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    Re: Pump pressure goes up very quickly even after backwashin

    Vacuuming to waste is a good idea.

    Let me know how the clarifier works and what the brand is. I'm keeping a log of them and which ones work.
    Dave J. TFP Moderator
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    Re: Pump pressure goes up very quickly even after backwashin

    Quote Originally Posted by Bama Rambler
    Vacuuming to waste is a good idea.

    Let me know how the clarifier works and what the brand is. I'm keeping a log of them and which ones work.
    I used a product by Leslie's Pool Supply called "Ultra Bright". It seemed to do the job, the kids played in the pool today for the first time!
    [attachment=0:21ji30mc]IMG_2459.JPG[/attachment:21ji30mc]
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    Mod Squad Bama Rambler's Avatar
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    Re: Pump pressure goes up very quickly even after backwashin

    That's on the list as one that works. I'll add you to the list.
    Dave J. TFP Moderator
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    Re: Pump pressure goes up very quickly even after backwashin

    Quote Originally Posted by Bama Rambler
    That's on the list as one that works. I'll add you to the list.
    Where is this list you are referring to? Before I buy anything else it would be great to know what works and doesn't. Thanks.

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    Mod Squad Bama Rambler's Avatar
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    Re: Pump pressure goes up very quickly even after backwashin

    It's a personal list that I'm keeping as people report that they used clarifier or floc. It's not posted anywhere as there's not enough data to form a concensus of what works and what doesn't. That's just on the list two or three times and it's been reported to work. It'll probably take another year or two before I'm sure enough of the results to report it.
    Dave J. TFP Moderator
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    Re: Pump pressure goes up very quickly even after backwashin

    I also used this once a couple years back (way before BBB) when i had an algae attack. I had to pour a certain amount and let my filter run overnight and my pool was clear by the morning.
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