First time pool owner (came with the home we just bought). Was opened by professionals who seemed to suggest filter works fine. But the algae didn’t go away. So I went through Leslie’s treatment of soda ash , green to clean and then 24 pounds of PPP etc. Pool had started to clear up (my neighbor and I have been putting more soda ash/ liquid chlorine since). My Ph was at 7.2, cya was in range and choline was a little low. The pool was still muddy. It rained and 1 day later the algae was back again. So I shocked it with 12 gallons of 12.5% liquid. Algae seemed to have reduced but it’s not close to zero. When I went again to Leslie and they are asking to do the entire protocol again I am almost $1k in at this point). The manager said maybe my filter was not perfect and asked me to check if the water flow back was with force - and it was not forceful. So I thought I would ask if the filter is not perfect does it make sense to keep shocking? Any other tips on how I can check if the filter is working perfect? The pump def seems to be working. Thanks and sorry for the long first post!!