I got a 20,000gallon in-ground pool with a DE filter. Two weeks ago I had the DE from the filter cleaned out and recharged with "fiberclear" type stuff. Seemed to work great and the pressure reading on the filter looked in the normal 15psi range.
A week later now I noticed the pressure reading on the filter is very low, maybe only 3psi. However the water flow looks OK on the pool side.
Stopped the pump, opened the pressure release valve, fastened the loose looking anchor bracket, restarted the pump and close the valve after air has been blowing out. However the pressure is still low.
What could be the problem? Could it be we put too little of the fiber clear stuff in originally ( the pool guy didn't really measure it) and what was there got leaked out, so that the filter is running empty without resistance now? Or a leak somewhere? Can't identify any obvious problem. I"m kind of hesitant to try anything the would potentially break things.