Manufacturer Water Chemistry Recommendations vs TFP


Well-known member
Dec 12, 2018
I’ve been using TFPC since March and I’ve had the most beautiful, crystal clear water!

I was reading my liner manufacturer (loop loc) recommended chemical levels and was surprised to see that their recommended FC levels is so low (between 1.0 and 1.5 - Vinyl Swimming Pool Liner Maintenance and Care)

They say higher levels will “attack” the liner.

Based on my CYA of 40, my target FC is between 3-7. Problem is, in order to keep it from dipping below 3ppm I must raise my FC to around 7 or 8 each night because I lose between 3 and 4 ppm on a normal day.

Is the trade off to shorten the life of my liner to keep my pool sparkling?

Should I consider only raising FC enough to around 5 and risk letting it dip below 3ppm?


Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
Laughlin, NV
Pool Size
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
The FC they state is without the buffering effect of CYA. Your 7 ppm FC with 40 ppm CYA is significantly lower effective chlorine than the 1.5 ppm they state.
  • Like
Reactions: dcjbhm
Thread Status
Hello , There was no answer in this thread for more than 60 days.
It can take a long time to get an up-to-date response or contact with relevant users.