I'm using some Cal Hypo bars (HTH) and Triclor pucks to raise my CYA and CH on a pool I've recently drained. I'm finding that the Cal Hypo bars seem to dissolve much slower and add much less FC than the Trichlor on a tablet for tablet basis. The Cal Hypo stock was old (the bottom fell out of the bucket on the way in the van) but I didn't imagine it could degrade. I did leave them in the plastic sleeve they come in and that was removed from the skimmer after.
I had to run the pump almost twice as long to maintain the same FC level. As soon as I went back to the Trichlor the usage went back to normal (removing doubt as to weather I had a nascent algae problem).
Should I just add more bars to the skimmer ?
Thanks in advance for any help.