I have been pretty obsessed about pool water chemistry since I had my 5 year old pool replastered this spring... I use the K 2006 test kit... my numbers...I have a SWG... FC 5.2 TC 5.2 PH 7.8 TA 70 CH 450 CYA 60...My CYA is a little low so I added conditioner yesterday..I know my CH is a little high... but..
My big problem is I am getting dark brown spots about the size of a dime near my return... No where else in the pool..What could it be and what do I have to do to keep these away.. when I brush hard with my wire algae brush (thanks waterbear) ... they go away.. only to return the next day... sometimes 2 or 3 and some days.. 6 to 10..color may have a tinge of yellow/green as well.. they have a tight splatter pattern..
help... what do I do..??