Discrepancy b/w TFP recs and SWG Target recs—why?

[Amy DiChiara]

I have been a long time a TFP follower for my prior chlorine liner pool and have been happy with the results. We recently built a plaster pool and just had the salt added to it. So this is all new to me—plaster and SWG. Unfortunately, I did not have an opportunity to be involved in the SWG brand selection and the Jandy TruClear was installed. Just now reading on here that it’s an entry level SWG, really should be for smaller pools, and doesn’t even read the salinity. A bit disappointed to discover this. The pool construction company we have been dealing with has been a disaster—their company is going under and it’s actually a miracle that we got them to come out to take care of some punch list stuff and even put salt in our pool.

My question is an about the chemistry levels I should maintain bc there are some significant discrepancies be the manufacturer and TFP recommendations. Jandy’s Owner’s Manual states:
Free Chlorine: Ideal levels should be 1.0 - 3.0 ppm.
Chlorine Stabilizer (Cyanuric Acid): 30 - 50 ppm
Total Alkalinity: 80 - 120 ppm (U.S.)
Calcium Hardness: 200 - 400 ppm

But TFP states:
FC: 5-7 ppm
TA: 60-80
CH: 350-450 for plaster
CYA 70-80

I am a little nervous to veer away from the Manufacturing recommendations, but I do trust TFP…

1) Why does TFP recommend such a high CYA? Couldn’t a lower CYA allow a lower FC?
2) Will my cell be able to maintain a FC 5-7 ppm for my size pool (25-28K)? If not, should I go with a lower CYA?
3) Why is there a discrepancy for the TA targets?

4) Any encouragement re: the SWG we already have? (TruClear) I’ve been discouraged about our building experience.
5) Any benefits with adding Jandy TruSense™ water analyzer? Is it reliable?

TIA for your help!

 

[mknauss]

The chemistry shown by Jandy is industry boilerplate. They show no difference regardless of chlorination method or pool type.
1. TFP levels of recommended CYA allows minimization of FC required each day to stay in target level.
2. Should. You will likely need to run at high % generation 24/7 as the cell is undersized.
3. If you attempt to maintain their TA and pH, you will be on the acid and baking soda hamster wheel. Don’t do it.
4. Replace it with an Aquapure 1400 when it fails.
5. No.