I can plug the top skimmer since my july installer didn't do a ball valve.Yes I have added this recently but am not sure how great it is. POOL BLASTER Max Cordless Pool Vacuum for Deep Cleaning
I have not backwashed since last week- pressure has been 10-15.
Pool grade DE- that's added to the skimmer by the filter and pump correct? Not the skimmer at the top near the pool line?
Then I assume pour some DE into the skimmer at pump near filter. Here's my setup.