High Pressure Problem On A Swimming Pool Sand Filter

by Gina

High Pressure Problem On A Swimming Pool Sand Filter

by Gina
(Swanzey NH)

We have back washed it several times and the pressure remains high. The filter is not strong anymore like when we first bought it. The sand and pump are only 3 weeks old.

We got sediment in our pool from running our well dry attempting to fill it and have been tryng to clean it ever since. We used flocculant and it was run through the filter before we read directions which stated to vaccuum it out through waste. Would that ruin the sand? The pressure is not high when we vaccuum through to the waste or backwash but is high on filter and recirculate. Do you have any suggestions on how to correct?

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Thank you for your question Gina

First I would ask how the return water is to the pool and if that's normal? Your gauge should be reading an increase and the water flow to the pool should decrease as the filter gets dirty. If the flow rate is strong, the issue might just be a faulty gauge.

First check to see if the gauge goes down to "0" when the system is off. If it doesn't, the problem may be a faulty gauge and you'll need to replace it. If that is not it, run the pump with the Multi-Port Valve "recirculate" position and see if it makes a difference in the flow rate back to the pool or a difference in the gauge reading. You should see a small difference here.

If you still have the problem, it's not a problem in the filter tank, it might be some kind of blockage in the lines. If this does cause the pressure reading to drop back to normal, there may be some internal damage inside the tank (but you might have been able to see this when you changed the sand.) Knowing the make and model number would be helpful in troubleshooting.

Filter sand normally needs to be replaced only once every 3 to 5 years, sometimes more depending on the usage, but it should not cause the problem that you're having after only after a few weeks, unless the filter was really clogged up with debris for some reason. Be sure the bottom drain, skimmer(s), and pump motor basket are all free of debris.

Best of luck