Hello all, new to the forum and looking for help. Have been fighting a small algae issue since the end of last season. Crystal clear water but greenish patches appear on the bottom and walls. Not slimy, more dustlike and forms greenish tinted clouds when brushed. At first we thought it was green algae, but now I am thinking mustard algae because it keeps coming back after we shock. We have been using pucks for chlorine and chlorbrite from leslie for shock, but are now about to switch to BBB to give it a shot. Floater has been removed and waiting for levels to drop to start bleach.
This past Friday I shocked and brushed the entire pool, and then on Saturday vacuumed every inch including the walls and ladder and broke down the filter and cleaned it completely. No algae Sunday, and most of Monday, but just now at 7pm I noticed a few small patches on the walls behind the ladder that definitely were not there earlier today because we were in the water all day.
TF100 just arrived today, here are the results:
Added 31oz of soda ash using poolcalculator recommendations and tested again:
According to the chart, for a CYA level of 70 shock level is 28 and we are still over that, how is this algae coming back with chlorine that high? Please help...