Although many people swear by their DE filters, ALL the mods use sand filters -- although Janet switched to Zeo a year or two ago. It is so much less hassle and honestly, I'm not sure my water could get any clearer with something else. Have you tried added a little DE to your sand filter?

Since you have CC of 1.0, you need to shock the pool again. For a CYA of 30, that would mean shocking it up to 15ppm. I would just use bleach if I were you since you are battling cloudiness. In an 18K pool, each gallon (4 quarts) of 6% bleach will add about 3.3 ppm of cl. Keep your chlorine at shock level as consistently as you can until your water clears, you have no higher than 0.5 CC and you can go from sundown one evening until no longer than 2 hours after sunup without losing more than 1ppm of cl. It may take a couple of days, but with a working filter and consistent shock level, it should clear up. Also run the pump 24/7 while you are trying to clear it.