Chlorine Recommendation Exceeds Heater Recommendation

pool512

Member
Jul 12, 2021
14
Georgetown, TX
Pool Size
16000
Surface
Plaster
Chlorine
Liquid Chlorine
I have been following TFP guidance, and use the Pool Math app for logging tests and making corrections (using liquid chlorine). All has been going well to this point, but I've run into an issue with the recommendation.

CYA is at 50, and the Pool Math app recommends 4-8 FC, with a target of 6.

I just added a Raypak 406A Heater (399K propane heater with copper fin tubes), and the manual states that it's very important to maintain pool chemistry to prevent damage, which includes FC of 2-3, which "MUST NOT EXCEED 5 PPM" (caps and bold are theirs).

The Raypak recommendation seems very low compared to what I've been doing based on TFP and Pool Math recommendations, but I also don't want to harm my new heater. Any ideas? Thank you!
 

Newdude

Gold Supporter
TFP Guide
Jun 16, 2019
11,511
NY
The Raypak recommendation seems very low compared to what I've been doing based on TFP and Pool Math recommendations, but I also don't want to harm my new heater. Any ideas? Thank you
The manufacturers just repeat the industry standards/mthods which don’t believe in the CYA\FC relationship. Knowing what you do, you know that with following the FC/CYA Chart, your pool water is less caustic than tap water.

Keep up the good work !!
 

derekm

Well-known member
Aug 17, 2007
137
Eastern Canada
Been using Raypak propane heaters since 1994 or so. No issues with higher chlorine noted (I try to keep a minimum of 5 ppm). Got 15 years out of the 1st one. It succumbed to rust, not chlorine! I have no bypass of the heater when it's not in use, but I do have a check valve in the line to keep chlorinated water from entering when the pump is off.
 
Last edited:

Donldson

TFP Expert
LifeTime Supporter
Jun 12, 2009
5,159
NW Ohio
As everyone's said, it's a boilerplate warning that doesn't account for CYA. The real concern with copper tubes is pH. I've never seen high chlorine do damage, but I've seen acidic water eat through heat exchangers in a matter of days. Don't let your pH drop below 7.2 and never put chlorine tablets in the skimmer and you should get a good life out of your heater.
 
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