Filter makes gurgling noise when pressure is lowered

[r&r]

So my filter makes noise like there is air in the valve only when I am not sending the return water through the pool heater.

From my filter i can either send the water through the heater or straight out to the pool.
Whenever I close off the heater and send the water straight out to the pool I get a drop of a couple pounds of pressure on the filter and the air noise starts up. So I always just ran the water though the heater first then out to the pool.

Now my heater has started to leak and I can no longer send water underpressure to it without a wet pool house.

I never used the heater and don't plan on buying a new one, but I can't stand that air gurgling sound in the filter it makes as much noise as the pump does in first place.

Any Ideas on how to stop this?

 

[JohnT]

Is your pump strainer basket completely full with no bubbles?

 

[r&r]

Yes completely full and sealed. Doesn't make sense I know.

 

[duraleigh]

Air can only enter the system from the suction side.....from the skimmers to the pump.....nowhere else.

A pressure drop when you close the heater indicates increased flow which makes sense.

Since there is NO air entering (Look again at the pump basket lid when the pump is running) then it would seem your noise is coming from some source other than air. What that might be I have no idea.

If you shut off the pump, does the pump basket stay full of water for 12 hours or so or does it slowly fill with air?

 

[Bama Rambler]

Welcome to TFP.

What filter do you have. It always helps to know what equipment we're dealing with. It would be good if you could put your equipment info in your sig so it'd be available all the time.

There are reports of filters making a noise under high flow rates, but without knowing which filter you have I don't know if it's one of them.

 

[r&r]

The system stays primed so that would make me think it is something other then air making the noise but air gurgling is what it sounds like.

Maybe something in the filter starts rattling around like larger pieces of sand or pebbles? I've tried to clean that stuff off the top buts its a mighty hard process.

Its a hayward sand filter don't know the exact model right now. Hayward pump 1.5hp. Sta-rite heater. pool is 17x37 grecian.

 

[Bama Rambler]

Find out the model number if you can, but some Hayward sand filters had a rattling problem.
You can search for it and should be able to find a few posts about it and how it was fixed.

 

[r&r]

Thanks that sounds like what I've got I'll look into it.

 

[r&r]

The filter is a hayward s220t I haven't been able to find anything on here or the web that sounds like the same problem I have.

 

[Bama Rambler]

If I remember correctly, it was the stand pipe and I think the fix was to slip an o-ring over it and let it sit against the multiport valve port.

 

[r&r]

Thanks! I will give that a try when I open it up this spring.

 

[jblizzle]

When bypassing the heater and seeing the lower filter pressure, that means you are likely increasing the flow rate. Since it does not sound like you are actually seeing any air anywhere, I think Dave is likely right that something is "rattling" in the filter at the higher flow rate.