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.