Water does not appear to be filtered very well

[aylad]

The shock level you have to attain to kill off algae is dependent on your CYA level. With a CYA level of 30-50 ppm, your shock level is 15 ppm of chlorine, which you need to attain and then maintain, by testing and adding more chlorine as needed to get back up above 15 ppm, as many times as possible during the day. Hold that level until the green completely clears and until you can go from sundown one night to sunup the next morning without losing more than 1 ppm of chlorine. After you get it all cleared up and have no overnight chlorine loss, then you need to maintain your chlorine levels above 3 ppm at all times to keep the algae from coming back.

I think the problem is that you were never completely killing it off to begin with, so it just grew back when you allowed the chlorine levels to come down.

[leena]

oh ok, thank you, is it better to add liquid chlorine when trying to raise the FC rather than bleach? I can get approx 3 gallons of 6% bleach for $5 or 1 gallon of 10% for $4.50. I have never used liquid chlorine and live 45 min from the nearest pool store so I have no ideal how much it costs or how strong it is....