Hayward DE filter issue

skos

Active member
Aug 17, 2010
41
I have an in ground gunite pool and spa about 4 years old with a Hayward DE (Diatomaceous Earth) filter.

When the pool motor starts each day the pressure is fine and the spa fountain is correct (about 3 feet of water coming up). In about 5 mins the fountain is only 1 inch up. It appears I have an air leak somewhere?

I have replaced all motor seals, replaced entire backwash assembly. Replaced motor basket cover and seals, motor basket, replaces Hayward DE gasket and drain plug with gasket. I also replumbed the motor to the DE filter

It’s not an issue with backwashed, opened and cleaned. I do that when it needs it.

I completly took apart filter. Cleaned and it is working fine now.
I did not add any DE as I want to see what if anything would happen. The filter went a week before losing I lost the fountain pressure.

I backwashed and it worked for another week. So I cleaned the filter and added DE.

It lasted 1 day before losing pressure to the spa fountain.

Ideas?
 

JohnT

Admin
Mod Squad
TFP Expert
Apr 4, 2007
9,475
SW Indiana
What does the water look like? What is your pressure reading when the fountain is only an inch high? Does backwashing and replacing the DE restore the flow?
 

zea3

Mod Squad
TFP Expert
LifeTime Supporter
Jul 10, 2009
11,067
Houston, Texas
Did you check the impeller? Does the sound of the pump change after it has been running awhile? I saw in your other thread that a clog caused damage to your pump. Did you make sure all the debris is removed in the plumbing from the skimmer to the pump?
 

skos

Active member
Aug 17, 2010
41
JohnT said:
What does the water look like? What is your pressure reading when the fountain is only an inch high? Does backwashing and replacing the DE restore the flow?
water is clean. backwashing & added DE does replace the flow but only for 1 day
 

skos

Active member
Aug 17, 2010
41
zea3 said:
Did you check the impeller? Does the sound of the pump change after it has been running awhile? What was it that caused the pump to run dry in the first place?
impeller is perfect. pump does not change sound. Pump ran dry as a result of after a storm and the skimmers getting loaded with leaves
 

zea3

Mod Squad
TFP Expert
LifeTime Supporter
Jul 10, 2009
11,067
Houston, Texas
skos said:
zea3 said:
Did you check the impeller? Does the sound of the pump change after it has been running awhile? What was it that caused the pump to run dry in the first place?
impeller is perfect. pump does not change sound. Pump ran dry as a result of after a storm and the skimmers getting loaded with leaves

I edited my post, since I remembered your other thread from this morning. Is the plumbing clear of debris from the skimmer to the pump?
 

skos

Active member
Aug 17, 2010
41
zea3 said:
skos said:
zea3 said:
Did you check the impeller? Does the sound of the pump change after it has been running awhile? What was it that caused the pump to run dry in the first place?
impeller is perfect. pump does not change sound. Pump ran dry as a result of after a storm and the skimmers getting loaded with leaves

I edited my post, since I remembered your other thread from this morning. Is the plumbing clear of debris from the skimmer to the pump?
No debris anywhere
 

JohnT

Admin
Mod Squad
TFP Expert
Apr 4, 2007
9,475
SW Indiana
Tell us about the pressure readings. When it's working and when it's not. How are you cleaning the interior of the filter? Acid soak?
 

JohnT

Admin
Mod Squad
TFP Expert
Apr 4, 2007
9,475
SW Indiana
It sounds like your filter is simply catching dirt. Not really much other reason for the pressure to rise in a DE filter if backwashing clears it.

An air leak would cause a pressure drop.

Running the filter without DE probably resulted in clogged grids, which won't clear by backwashing. They'll need to be cleaned.
 

skos

Active member
Aug 17, 2010
41
I agree with you as when I ran it without DE for a week I had no issues.

so what is the best stuff to clean the grids?
 

zea3

Mod Squad
TFP Expert
LifeTime Supporter
Jul 10, 2009
11,067
Houston, Texas
Dissolve 1 cup of TSP (real TSP not TSP substitute) or dishwasher soap to every 5 gallons of water. Put the grids in a large container, such as a garbage can, and fill with enough cleaning solution to cover the grids. Let the grids soak overnight, then hose off completely. If the grids are still clogged you can soak them in a solution of 1 part muriatic acid to 20 parts water. Soak grids until bubbling ceases. Rinse completely. You don't want to do an acid soak unless absolutely necessary. If you don't do it right you may damage your grids.
 

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