Question about Pentair Fns Plus 48 sqft De Pool Filter (In Ground Pool)

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My Pentair FNS 48 is having problems. I have a kreepy Krauly that will have strong suction when pool pump first turns on but then it weakens after about 4-5 mins and then completely stops. I've tried to open the air relief to see if there was air stuck inside and the valve opens but does not spurt water no matter how long it's been open. I tried to open it just as I turn on the pump and it does spit out air and then steady stream of water (no where as powerful a stream when I did this a few months ago). The gauge does not register at all. I ordered a new gauge, followed instructions on installation and it still does not register any psi. Can you tell me what I should be looking for? I recently took the filter apart to spray clean the grids and added 4.8lbs of D.E. Do you think maybe I damaged something inside? If so, any idea what it could be? Incidentally, we've just had a couple of windy months and the pools been heavily leafed filled.

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  • tweety868 Apr 28, 2010

    I've clean around the impeller and just snaked the hole that goes from the intake and was able to remove some large leaves. I started the pump again and the gauge is not register anything. Doesn't move at all. The pump has now been on for 10 minutes and it is slowing down again. I open the air flow and no water is coming out. As I am writing this, the kreepy krauly has stopped moving.



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You can try to clean the impeller ether by removing the pump basket and reaching inside the hole behind it to feel for a clog. Do this with a screwdriver or needlenose plier. If it feels spongy work the clog counterclockwise and then try to pull out with the pliers. Hlso if you have had a alge problem since you cleaned the filter you may need to clean it again. Also you need to kill any alge before you run the pool.

Posted on Apr 28, 2010

  • Kieran Ruppert Apr 28, 2010

    Your air pressure is not the problem that is probally just a clog in the air bleed "T". If you pulled junk from the impeller and it is doing this still you may need to break the pump down and clean the impeller out by hand with a piece of wire. For this you should have a tank body "O" ring on hand as the old one will be hard to seal again and you will probally need the new one. Also pick up a new pump basket to keep this from happening again. Also you may need to check for a clog in your suction pipe.



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Posted on Jan 02, 2017

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SOURCE: KREEPY-KRAULY Ties itself into a knot while cleaning.

We removed 2 portions of hose located at the Krauly end, and attached those at the filter end, then we took the 2 portions located at the filter end, and placed those at the beginning of the Krauly end.
Apparently the problem was that the 2 portions of hosing at the Krauly end had become "twisted" and continually enabled the Krauly to move in the knot tying direction. By replacing these 2 portions at the Krauly end with "un-twisted" portions from the filter end, this ended the twisting cycle.
The Krauly has been running for 48hours straight now without a single knotting episode.
If we see the knot tying direction beginning again, we will repeat these steps, continually replacing with un-twisted portions.
At 1st we thought we needed to purchase some new tubing, but we didn't have to, only needed to move around some hosing.

Posted on Jan 05, 2010

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Need operational manual

the manual is available at this web add, thanks be sure to leave a good rating.....

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