Hi, and welcome to the forum!!
Your pool keeps going cloudy and green because you're not keeping enough chlorine in the pool, period. With a stabilizer level of 50, a cl level less than3 ppm is an open invitation for algae. You need to shock the pool to 15 ppm (we recommend plain, unscented bleach for this) and hold it there until the pool clears and you can go from sundown to sunup the next morning without losing more than1 ppm of chlorine. This will requre that you be able to test your water with drop-based testing, no strips. In 30 gallons of water, each gallon of 6%bleach will raise your FC by 2 ppm, so you're looking at about 8 gallons for the initial shock. Then you need to hold it there by testing and adding more bleach as needed to stay over 15 ppm. Don't add anymore flocs or clarifiers-- they can make your problems worse if you're not careful, and you don't need them right now anyway.
Make sure you have a working pressure gauge on your filter, and don't backwash it til the pressure rises 6-8 psi over your. Lean pressure.
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