Mornin Matty, A bit more information would help too. You say you have a edit sand filter.
edit How long are you going between backwashes.(With high amounts of dead algae being filtered one can expect to have to backwash more than "usual" during the clearing up process.)
edit What is the starting filter pressure, psi, after you backwash, and how much increase in psi do you allow between backwashings?
edit When you backwash does the "clean starting pressure" of the filter go back down to the usual pressure?
How much time do you run your pump for circulation every day?
Where do you live?
What are the air temps?
What is the water temp?
How much sun hits the pool during the day?
Do you have an automatic cover and do you use it?
How much and what kind of debris enters your pool? (fine debris like dust, silt, and sand or larger debris like plant debris or a combination)
Do you have a lot of wind blowing debris into the pool?
How do you clean your pool and how often? (manual vacuuming or automatic vac cleaner or pressure side cleaner, or robot or a combination)
The answers will further help in assisting you to clear your pool, in addition to getting a handle on the chemistry of the pool, killing all the algae, and keeping algae from reappearing.
Many people, here on the forum, who now have sparkling pools, have come to the forum, initially, because they couldn't get their pools cleared up. In most cases the solutions are fairly easy once all the info about the pool and conditions are known.
Most of us, with the exceptions of those extreme environments and unusual problems, spend very little time and very little money, keeping the pool clear and sparkling. I have one of the most EXTREME environments, with extreme heat and sun, very high bather load from a pack of, very active medium, large, and GIANT dogs dragging in huge amounts of sand, silt, and dust all day, "dustbowl" with year round high winds, no cover, yet my pool stays sparkly, clear, and sanitized year round (with a few exceptions). I don't let "those" take control and exist for very long and I have depended on the good people here at TFP to accomplish this. I have the most sparkly, clear, and sanitary pool of any pools owned by anyone I personally know. And you will never smell, taste, or feel any effects of chlorine unless it is just a few minutes after I add bleach. There are very few pools I will swim in or let my dogs swim in. None of those people/pools have near the challenges my environment produces daily and year round. BTW.... I "converted" to the methods, advocated here at TFP, last summer. As far as debris cleaning I do spend more time than most people but only 5-10 minutes, three days a week, four at most, checking and adjusting chemicals.
Mind anyone who should question..... I'm not bragging about my efforts, rather extolling the methods taught here at TFP and the fine people here who are always ready to assist and even "hold our hands" when we have problems and issues.
You'll get there and should be much sooner than you expect. :-D
gg=alice
