I am desperate for help.

I have a cheap pool compared to you guys I'm sure bit I'm still having problems. I have an 18 ft dia 4ft deep summer escapes pool. I retro fitted a 2500 get intex pump when my pump went out (1500 gph) lay year went great. This year I have been fighting green and now white cloudiness all year. I have the pH at 7.2. Alk at 100 hardness at 100 fc at 5 and cya at 40. Pool is roughly 6400 gallons of I added right. I have white cloudy water and I can barely see the bottom. How do I fix this and is it safe to swim in the way it is?