Previous owner said it needed to be changed. I was a pool NOOB and uneducated. I got the stuff at Lowes right next to DE stuff $25 a box. Pool worked fine last year.

So I need sand from the pool store? My filter holds 150lbs. It does not have a pressure guage how can I add one.

For those following my other thread...pool was drained to 12-14 inches left. Started hose last nite and shut it off about 8PM tonite. I got all the debris outta the pool and am now filtering it over nite. I used the strips for a quickie and the FC and TC was still at the top of color chart. I will test CYA in am and chlorine etc and go from there. Pool is cloudy but much better.