Hi 2nd year pool owner. reading TFP post have helped me alot have a clean nice pool but now I need some help. I have a 27 ft round above ground pool with a hayward sand filter(this year I am running filter glass and pea gravel), water is perfect, but when I have the directional diffuser on the outlet (the part that necks down from 1.5" inch a smaller hole to increase pressure and water movement the filter blows dirt into the pool at initial startup and pool bottom shows alot of dirt. The filter did this last year as well when I had sand in the filter, After troubleshooting i found when I remove the diffuser and let 1.5" inch all the way into the pool no dirt comes out at startup but my water movement is impacted so I dont want to operate this way. Is this due to very high initial startup pressure pushing dirt all the way out of filter? It seems initial pressure is causing the problem.
What size should the outlet hole be,
inital clean filter pressure is like 18 PSI with the diffuser and about 10 PSI without. So this extra 8 PSI seeems to blow dirt back into the pool at startup.
any help is appreciated!