Help me understand?

[Flathead-dude]

So I took a chemical test today and had a few questions, maybe someone could shine some light.Water looks ok. Thanks for any help
1. How often should do a full test?
2. I don't understand FC/CC these are all my readings today, should I do anything?
PH 7.4ish
TA 100-110
CYA. 50-55
CH 20
FC 4.0
CC. .5

 

[PoolStored]

So I took a chemical test today and had a few questions, maybe someone could shine some light.Water looks ok. Thanks for any help
1. How often should do a full test?

Basic Pool Care Schedule

This basic pool care schedule can guide you in creating your own pool care routine. Regular pool maintenance will keep your water sparkling!

www.troublefreepool.com

2. I don't understand FC/CC these are all my readings today, should I do anything?
PH 7.4ish
TA 100-110
CYA. 50-55
CH 20
FC 4.0
CC. .5

Get that FC up to recommended range. Use 60 for your CYA (always round up)....Link-->FC/CYA Levels

 

[Flathead-dude]

So if I'm at 60 CYA my Fc needs to be 7- 9? Sorry very new, was under the assumption I wanted never higher tha. 4

 

[PoolStored]

So if I'm at 60 CYA my Fc needs to be 7- 9? Sorry very new, was under the assumption I wanted never higher tha. 4

That is correct. And never let it get below 5...that's algae city.

HOCl is the stuff that is the result of adding liquid chlorine to water. It is what sanitizes the pool. It is what can be harsh on skin and swim suits.

The HOCl with CYA 0 and FC 1 = ~.5ppm HOCl. Which is about 5x higher than CYA 60 and FC 9 = ~.1ppm HOCl.

 

[Flathead-dude]

Is there a reason my FC and CC are soo far off or is that normal??

 

[PoolStored]

You want enough FC to sanitize. Use the fc/Cya tool.

Cc= Combined Cloramines. 0 is ideal.

They measure different things.

 

[Deb04]

You're FC is low for your CYA. Ideally your CC should be 0.

FC = Free Chlorine. Chlorine available to kill stuff.
CC= Combined Chlorine. Left over bits of Chlorine that has already killed stuff. Goal is 0. A CC of 1 or more indicates there's a problem. A CC <1 doesn't prove that there is no problem.

From prior posts it looks like you have a Taylor 2006 test. Can you add that info to your signature so that we know when we're answering your questions. It also looks like you're using liquid chlorine. Good. Since you're in Mass, in case you don't know, Ocean State Job Lot has 12.5% chlorine for $5.99 per full gallon.

 

[Flathead-dude]

Ok, so what is I see is good an normal. Ill Check out job lot, got 1 a few miles away.
Thanks.

 

[Deb04]

Ok, so what is I see is good an normal. Ill Check out job lot, got 1 a few miles away.
Thanks.

Normal, but not good. Your FC should not drop below 7 at your CYA level at any time or algae will start.

 

[PoolStored]

Your FC should not drop below 7 at your CYA level at any time or algae will start.

5 FC is minimum for CYA of 60.

 

[Deb04]

5 FC is minimum for CYA of 60.

You are right, PoolStored. I got confused with 7-9 being the target.

 

[Flathead-dude]

Thank you both. Added some chlorine tonight, I'll see where things are tomorrow. Stay safe.

 

[PoolStored]

 

[Flathead-dude]

So to tonight's reading after adding chlorine the other night. So do I do nothing? All seems good. Hasn't been sunny at all, don't know how that effects the usage of chems.
Ph 7.4
TA 90-100
CYA 60
FC 9
CC. 0- .5

 

[Mdragger88]

Test fc daily to get an idea of your fc consumption depending upon conditions- a sunny summer day can eat up 4ppm fc .
When ph rises to around 8 use acid to lower it to mid 7’s
& go swimming!!

 

[Flathead-dude]

Cool, thank you.

 

[Saturn94]

5 FC is minimum for CYA of 60.

I always suggest staying well away from “minimum”. I’ve seen too many posts where people have issues despite keeping FC at/near minimum. Being near minimum leaves no room for error, and some pools will have issues at minimum (ask me how I know).

Just my 2 cents.

 

[Flathead-dude]

So today CYA seems closer to 70 FC is 8.5. Can I lower the CYA other than emptying water? Seems it's getting too high. Probably from when I only had the liquid stabilizer.
Also what are good targets #s I can compare my test too?

 

[mknauss]

Also what are good targets #s I can compare my test too?

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

Basic Pool Care Schedule

This basic pool care schedule can guide you in creating your own pool care routine. Regular pool maintenance will keep your water sparkling!

www.troublefreepool.com

 

[Mdragger88]

So today CYA seems closer to 70 FC is 8.5. Can I lower the CYA other than emptying water? Seems it's getting too high.

If you don’t add anymore things that contain cya (stabilizer/trichlor/dichlor) then it won’t increase. The only way to lower cya is to replace with fresh water.
Your pool is very small so each backwash likely has a pretty good affect on water loss. By Maintaining the proper fc for your cya you can live with it until it comes down via backwashing, splashout etc.
always follow the FC/CYA Levels
If the need to do the
SLAM Process arises you’ll want to exchange some water to lower the cya as that would require alot of chlorine.

Probably from when I only had the liquid stabilizer.

We don’t recommend using liquid stabilizer unless you can use the entire bottle because you can get very inconsistent results. It likes to stay in the bottle.
In your pool 1 gallon yields 70ppm cya. Going forward stick with granular cya when you’re in need.

Also what are good targets #s I can compare my test too?

FC/CYA Levels
& the ideal levels page posted above.
Also
PoolMath shows ideal levels based on your setup.