I have been testing religiously, every 3-4 days. we had a lot of rain recently and when i brushed this morning which i am doing about 1 time a week maybe sooner it was a yellow green cloud similar to algae. This pool was redone a couple a months ago to pebble and the darker color its hard to see a color difference until you brush. My tests as of this morning was PH-7.6 FC-3 TC-3 CC-0 TA-70 CY ACID - 50 Calcium-225 20,000 gallon pool chlorine with tablet floater in pool. Will be salt but have not switched yet. Is there something I am not doing correctly as to cause the stuff on the floor of the pool. I have not been running the pool cleaner but have been vacuuming once a week. Is this something I need to slam or could it just be dirt etc from pool cage and all the rain. I am trying to keep this pool clean and clear by checking so often and am confused as to the issue this morning.