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Thread: New Member with a low PSI question....

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    Join Date
    Jun 2014
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    Erie, PA
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    New Member with a low PSI question....

    Hello,
    New member here with a question about low psi reading at the filter, after having all new lines put in.
    I have a 15K gal inground pool, vinyl liner, with a 3/4 HP Hayward Maxflo II pump, and a 200 sqft cartridge filter. The pump and filter are two years old.

    Over the winter, I lost about 1/2 the water in the pool. After leak testing, the crew determined at least one line leaking and a bad liner. Before the pool could be tested, I had to have it filled and running for the test crew. At startup with a clean cartridge I was reading 10 psi, which is the reading I've always gotten. Since the pool is at least 25+ years old (pool came with house and we've been here 13 years) I decided to have all the lines and the liner replaced. Fast forward-

    After all work was completed and pool filled, I fired it up. Filled pump basket with water before starting, but noticed it was taking much longer than normal to fill up and I shut it down. I found that the crew had left a plug in the skimmer....hidden by the basket. I was not amused. Removed plug and restarted, everything ok, except PSI reading at 5 instead of 10. Also noticed that stream wasn't quite as strong as before when opening relief valve. Checked everthing I knew to check, looked for junk clogging the pump as best I could, made sure filter cartridge was seated and no obstruction between pump and filter, and replaced the gauge....still 5psi.

    Called pool guy, he didn't consider it a big deal, but agreed to come check it out. He brought his own gauge and still got 5psi. Stuck his hand in front of the returns and said I've got "plenty of flow". After a lot of head scratching, he said he was stumped and that the only thing he could figure was a torn filter cartridge. I've got two cartridges and think it would be a huge coincidence if they are both torn....His final verdict was, it's not a big deal and not to worry about it.
    But everything I've read in my internet searches indicates a problem somewhere.
    So am I making a big deal out of nothing ? Is it normal to have such a big difference ? This is really bugging me........

  2. Back To Top    #2
    Patrick_B's Avatar
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    Re: New Member with a low PSI question....

    Welcome to TFP!

    First, I'm sorry to answer with a question, but did you replace or clean the filters?
    TFP Moderator
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    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

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    Jun 2014
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    Erie, PA
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    Re: New Member with a low PSI question....

    Thank you !

    Same filters as last year, and they were cleaned before I stored them for the winter. The filter only uses one, the other is a backup and I rotate them.
    This will be their third season.

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    Charlie_R's Avatar
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    May 2013
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    Mexico, MO
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    Re: New Member with a low PSI question....

    It could be the old return lines had obstructions in them. Did you have stronger flow at the returns before the replacement of the lines?
    15'x48" 4500 gallon Intex pool, buried 1.5 ft. Pac-Fab Dynamo 3/4 hp pump. Hayward S180T sand filter, bought used. Taylor K-2006 test kit. Rocket mass heater based wood fired pool heater.

  5. Back To Top    #5

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    Re: New Member with a low PSI question....

    I think I did have , but I can't be 100% sure

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    May 2014
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    Lewisberry, PA
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    Re: New Member with a low PSI question....

    Might seem like a stupid question, but are the new lines the same size as the old lines?
    16,000 gallon Oval Vinyl Liner Pool (new liner 2014)
    Custom built in 1999 to be half in-ground and half out (sloped yard) vermiculite bottom, laser sighted to Florida Room and Deck
    Purex Triton Model cc100 Cartridge Filter, 100 gpm flow rate, Penfair 1HP Pump
    TF-100 Test Kit

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    Re: New Member with a low PSI question....

    Quote Originally Posted by joegus View Post
    Might seem like a stupid question, but are the new lines the same size as the old lines?
    Yes they are..

  8. Back To Top    #8

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    Jun 2014
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    Erie, PA
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    Re: New Member with a low PSI question....

    Okay, let me put it this way. Has anyone ever even heard of a situation like this before ?

    If I eliminate all other causes of a low psi reading, the only thing left would be an obstruction in the new lines going to the pump.

    Is that even likely ? They used the flex pvc that comes in rolls............

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