Minimum Rec. FC o.k. if no issues?

[Triumph65]

I have a 48,000 gallon plaster pool in full sun. Pool has 2x the filtration needed and we keep Polaris and baskets empty every day to keep as much biological material out of pool as possible.

Have been running 3-4 ppm liquid with 40 CYA for a year (since pool was redone) with no algae yet. The pool has a rolachem auto doser so the chlorine is maintained and does not vary by much.


Risks of staying at the minimum recommended FC level? Since it’s such a large pool the chlorine can get very expensive but also don’t want to create a problem that will cause a need to SLAM.

Thank you!



Central Texas. In ground 48,000 gallons. New plaster July 2021, Finest Finish Micro Fusion French Gray. (2) Pentair Intelliflo 011056, (2) Triton TR 100-C Commercial Sand Filters (glass media), (2) Waterco Multi Cyclone 50 Pre-Filters, 15 Gallon Rola-Chem liquid chlorine feeder, Polaris 280, Pentair Warrior SE

 

[ajw22]

Risks of staying at the minimum recommended FC level?

How close do you walk along the edge of a cliff?

Fall under the minimum and algae begins taking hold in your pool even if the water looks clear.

Then the algae waits lurking until another slip up and you get a full algae bloom.

Since it’s such a large pool the chlorine can get very expensive but also don’t want to create a problem that will cause a need to SLAM.

Then keep your FC at 5-7.

Your daily FC loss is the same whether you are at the minimum or higher then target. Your chlorine usage is the SAME.

One SLAM and it will have cost you more then what you think you saved trying to skirt the edge of the cliff.

 

[Triumph65]

@ajw22 - Thank you! Great point. I will make that change today and crank up the Rolachem.

May need to get a bigger rolchem tank, currently 15 gallon.

Should I keep my CYA where it is (at 40 ppm)?

 

[ajw22]

Should I keep my CYA where it is (at 40 ppm)?

In Texas 50-60 ppm of CYA would be best.

But if you raise your CYA your FC target increases.

The Free Chlorine and Cyanuric Acid Relationship

Managing your cyanuric acid and Free Chlorine levels is key to stabilizing your pool. Learn how these two items affect each other.

www.troublefreepool.com

 

[MITBeta]

Does the rolchem dose small amounts continuously? If so, your pool may be acting more like a salt water pool.

 

[Triumph65]

@MITBeta - It does indeed. Mine is an analog model. It has a numbered dial that you can turn up or down and responds by dosing in small amounts while the pump is running.