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Thread: pressure is rising after back wash and cleaning of de filter

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    pressure is rising after back wash and cleaning of de filter

    My pool was running fine for the past two days. Then the returns(jets) in the shallow end subsided. I cleaned out the skimmer basket and pumps basket as usual and back washed. After several times of backwashing, that the pressure gauge on the DE filter still read 30. So I opened the DE filter and cleaned it. I also cleaned out the jandy filter which was clogged with really old DE. When I tried to run the system again, the pressure was back to 30. And now there was a flow from both jets in the pool. Where do I begin with trouble shooting?

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    Mod Squad Bama Rambler's Avatar
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    Re: pressure is rising after back wash and cleaning of de fi

    What does your water look like?
    How much de did you add back to the filter?
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    Re: pressure is rising after back wash and cleaning of de fi

    When I first poured 3 (5 gallon) liquid shocks to the pool it went from dark green to light green almost teal. Today since it has not been running for more than 24hrs, it is dark green again!
    I have been instructed to add 5(9oz.) scoops to the skimmer.

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    Isaac-1's Avatar
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    Re: pressure is rising after back wash and cleaning of de fi

    DE should always be weighed with a scale the scoops can be WAY off depending on how it is packed, second if you are not already doing it and the pool is green you need to follow the SLAM procedures to get it clear pool-school/shocking_your_pool

    I doubt this is your problem, but you should be aware pool pressure gauges tend to be cheaply built and don't tend to last more than a few years, if the gauge shows pressures while the pump motor is off it is a sure sign it has failed
    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
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    Mod Squad Bama Rambler's Avatar
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    Re: pressure is rising after back wash and cleaning of de fi

    It sounds like the system is working exactly as it's intended to. Since you have a DE filter it's not uncommon for it to clog very quickly when you have algae.

    You should verify that 5 scoops is the correct amount for the model filter you have.

    Follow Isaac's advice on SLAMing your pool.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Am I being taken to the bank?

    Ok, I had the pool store come out and tell be what's wrong. The discovered I should have my grids acid washed. The filter has not been opened since I bought it in 2007. They call me this morning and say oh by the way you have tears in your grid that will be another 65 dollars. Would there have been signs that I had a ripped grid from the start. They said a few leaves must have torn it. How does leaves rip my grid?

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    Mod Squad jblizzle's Avatar
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    Re: pressure is rising after back wash and cleaning of de fi

    I would not pay 65 fit 1 or 2 grids since you can get all 8 off eBay for under $150 and start fresh. I think the leaf thing is hooey.
    Jason, TFP Moderator
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