Hello everyone -
New to posting to the site - but have been reading the tips for a while now here and over at pool forums, where i think everyone migrated from. Anywho...I use the BBB method for maintaining my pool. Started at the beginning of last season and havent looked back. Upon opening my pool this year (mid May) I found the pool to be crystal clear. I have something causing a yellowing on my pool liner, mostly in the deep end. I was able to brush some of it off - but there are large patches that I am not able to brush up. I dont know if it was an algae that discolored the liner - or it is just one tough algae that wont let go. The rest of the pool is crystal clear it is just these sections on the bottom that are causing me trouble. Does anyone know if this could be caused by yellow algae (i say yellow - because it's definitely not green) Some stats on the pool water:
FC: runs between 5-10 ppm, shocking to bring it up 20ppm
pH: 7.2 -7.4
CYA: 60 ppm
Alk: 110 ppm
Will a commercial algaecide work to clear this up? Could this possibly be just discoloration of the pool liner (it's not too old - only about 5 years old). Any helps you could provide would be fantastic.