With a CYA of 70, you must keep your chlorine between 5-10 all the time. If it dips below 5, you risk an algae bloom which is probably the reason for your cloudy water. You need to shock your pool, which with a CYA of 70 is up to 20ppm. (Take a look at the Best Guess Chlorine Chart in my signature below.)

Is your volume really 2300 gallons or did you mean 23,000 gallons?