Help: CC at 13

[rthompson10]

All,
Using a new pool company this year for our community pool- 50k gallons. After opening Monday they tested free CL at 1.6 and combined CL at 13. They are recommending emptying pool and starting over or adding cloe to 100 lbs of shock. We weren't happy with previous company as pool was left with algae and high CYA that we tried to treat with bio product.
What would recommendation be here?,

 

[ajw22]

What is the pH?

High CC at opening is indicative of Ammonia - Further Reading

If fresh water is not an issue a drain and refill may be the most cost effective solution for a community pool.

 

[Donldson]

Was any non-chlorine shock used in the opening? That can read as CC on some tests such as FAS-DPD.

 

[JamesW]

high CYA that we tried to treat with bio product.

What was the CYA then and what is it now?

What exact product was added and how much product was added?

Please post a full set of test results.

 

[rthompson10]

Was any non-chlorine shock used in the opening? That can read as CC on some tests such as FAS-DPD.

Only chlorine shock was used

 

[rthompson10]

What was the CYA then and what is it now?

What exact product was added and how much product was added?

Please post a full set of test results.

The company tested very little cya at opening- close to zero. With our test kit and test strips we came up with same readings. We used the attached product at end of pool season at recommendation of previous company. From memory it knocked measured cya by a good chunk but still over 100 so we were going to use it again but now no/minimum CYA

 

[rthompson10]

What was the CYA then and what is it now?

What exact product was added and how much product was added?

Please post a full set of test results.

 

[JamesW]

That is a bacteria that can potentially eat CYA and convert it into ammonia.

It is not reliable, but it can probably sometimes work.

You can drain and refill if it is safe to drain without damaging/floating the pool or you can try to SLAM to clear the ammonia.

 

[Bperry]

If you try and SLAM, use liquid chlorine shock and not the 100lbs of powder/tablets as that’ll cause other problems.