Fiberglass Pool Chemistry

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huffy70

Member
Nov 7, 2023
5
St Louis, MO
So first time pool owner, just trying to figure out my actual targets and I have conflicting information.

Our pool is a San Juan fiberglass, we have Pentair SWG, pump, and heater, and I have read the TFP Pool School stuff. Just wanting to see where I should actually try to land.

TFPSan JuanPentairLeslies
FC5-101-32-41-4
TC00.2 of FC
pH7.6-7.87.4-7.67.2-7.8 / 7.4-7.6 (first is SWG, second heater)7.2-7.8
TA60-80125-15080-120 / 80-100 (first is SWG, second heater)80-120
CH350-550200-275200-400200-400
CyA70-8030-4030-5050-100
Salt?3600-4500 / 3200 (first is SWG, second heater)2700-3400
Iron/Copper000-0.2
Phos<1250-100

Based on the above, I am thinking I should be targeting:
FC - 4
TC - 0
pH - 7.6
TA - 100
CH - 300
CyA - 70ish (pool is 75% full sun all day)

With all the moving parts, just trying to make sure I hit a target that makes everything happy. Does this seem about right?
 
Follow the TFP Guidelines. It is the only one that is based on modern actual experience and science.

You trying to tip toe between different methods and rolling your own will not end up well.

The science says FC of 4 and CYA of 70 do not work.
 
huffy70 said:
So first time pool owner, just trying to figure out my actual targets and I have conflicting information.

Our pool is a San Juan fiberglass, we have Pentair SWG, pump, and heater, and I have read the TFP Pool School stuff. Just wanting to see where I should actually try to land.

TFPSan JuanPentairLeslies
FC5-101-32-41-4
TC00.2 of FC
pH7.6-7.87.4-7.67.2-7.8 / 7.4-7.6 (first is SWG, second heater)7.2-7.8
TA60-80125-15080-120 / 80-100 (first is SWG, second heater)80-120
CH350-550200-275200-400200-400
CyA70-8030-4030-5050-100
Salt?3600-4500 / 3200 (first is SWG, second heater)2700-3400
Iron/Copper000-0.2
Phos<1250-100

Based on the above, I am thinking I should be targeting:
FC - 4
TC - 0
pH - 7.6
TA - 100
CH - 300
CyA - 70ish (pool is 75% full sun all day)

With all the moving parts, just trying to make sure I hit a target that makes everything happy. Does this seem about right?
Click to expand...
Hi, and welcome to the forum. I am relatively new here also. I am in my 4th season as a pool owner. Before I found TFP I was lost when it came to water chemistry. When I found this site, I too was apprehensive about some of the suggestions and I was testing water with an electronic tester. Now I test with the Taylor kits and follow TFP guidelines to the letter. I open and close my pool, and do all the weekly maintenance myself. Below is a pic of what my water looks like today. I have saved THOUSANDS thanks to the people in this forum. I know it seems like a leap of faith but if you follow the methods of this site to the letter you won't regret it.
Cheers.
Mark McLeroy
 

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mknauss said:
www.troublefreepool.com

What Are My Ideal Pool Levels?

Use our tool to find ideal chemical levels for any swimming pool. Check TFP recommended levels on pH, free chlorine, cyanuric acid, and more.
www.troublefreepool.com www.troublefreepool.com
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@mknauss I guess I am trying to figure out why my CH has to be so high.

Got a Taylor K-2006C kit and did a full round of tests yesterday. Did the test right after cleaning. Noticed that I had a LOT of white calcium scale in the robot filter, but no scale formation on the walls or floor that I could see.
pH - 7.6
TA - 180
CH - 330
CYA - 55
Temp - 83 F
Salt - 3900

My CSI is calculated at 0.22, which means I am fine, but I still have calcium precipitating out of the water. if i increase calcium more, I am just going to get more scale as it seems like the water is saturated with calcium to begin with. So I should be dropping calcium right?
 
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