I have a commercial pool that I am doing the water is crystal clear and the pool bottom has just been vacuumed then I cleaned the DE filter clean PSI is 13. 2 days later I come back the water is still crystal clear but the filter psi is now 32, I replaced 4 of the grids the other 4 are like new I put 6 pounds of DE in it and it is a 60 sqft filter I don't know what is going on I have been servicing pools for over 17 years and this is crazy clear clean water clean filter psi of 13 come back 2 days later and the water is still clear and clean but the psi is know 32 can anybody help
Thank you
Thank you