Thank you all again... I think I'm starting to understand how it all works.. I have successfully battled the biofilm/ algae.. no more slippiness yey .. Took a nice swim already.. Now I'm just waiting for my ALK and CYA to rise and then we'll see..
One more question...do you recommend algaecide? or those phosphate free solutions.. or as long as you keep the balance of CYA/CL .. is not necessary??