Question about Hayward 1.5 Hp Northstar High Performance Pump

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I have Hayward EC-45 filter leaking DE into pool via return line every start up. Checked all troubleshooting causes (tube tears, bad gasket, cracked tube sheets, loose bolts, o-rings, etc. All looks OK to 3 pool specialists. I'm out of ideas...can you help?

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If D.E. is returning to the pool, it's usually because you have a tear in the grids or the backwash valve is not working properly and returning D.E. back to the pool.

Posted on Aug 25, 2010

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  • mr_blobster Aug 26, 2010

    I don't have backwash or a backwash valve,

  • Dale Cobb Aug 26, 2010

    I apologize, I need the read the model number more carefully. I'm no expert on this particular filter, my expertise is with -ground gunite pools. However, if the D.E. is returning, there has to be something out of place or damaged to let it through to the return lines.

    I am surprised that three different pool techs could not diagnose and repair it for you. I wish I could see it in person, these type of things intrigue me.

    Hopefully you get it taken care of soon, I'm sorry I could not be of more help.

  • mr_blobster Aug 31, 2010




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If you have DE leaking in through the return lines, there are a couple of things that you should check. You probably having an opening or tear in one or more of your flex tubes. If that is the case, you will need to replace the damage tubes and the problem should be corrected. There could also be a rip or tear in the pool filters diaphragm gasket or it could be worn or loose. If you notice a problem with the diaphragm gasket, replace it. You could also have loose bolts on the tube nest plate. Try tightening these bolts.

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Here is a link to the hayward manual. Be sure to follow the pre-coating insturctions carefully.
Use only the swimming pool grades of
diatomite, such as:
CELATOM . . . . . . . . . . . Eagle-Picher Industries, Inc.
AQUA-CEL . . . . . . . . . . Johns-Manville Products Corporation
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WITCO . . . . . . . . . . . . . Witco Corporation
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