Pool is perfect, but i cant figure out this stupid hot tub......

[kris77]

So I just restored an older hot tub. I cleaned it 4 times with AhhSome. The first 3 times I had brown junk in the foam. The last time, i had nice white foam. So I assume its clean.

After the 4th cleaning, the next fill I just couldn't get pH under control. It was always above 8. 2 oz of acid did nothing for it. So I dumped 4 oz of acid in and overshot it. It was way below 6 on the test and smelled of acid. So to be safe, i decided to drain and refill. So now everything is doing fine except for the FC and CC. Fresh fill, CYA of 30, FC of 5 or 6 and it drops to zero overnight. So I thought I needed to SLAM it. So i brought FC up around 12 for the past 3 days. CC has been in the 2.5 - 3 range the whole time. Its a fresh fill in a clean tub and i have a CC of 3??? Makes no sense to me. I've been holding at 12 for 3 days now and nothing is happening. So last night i put another 3 oz in to bring it up around 15 or so. I didn't get a chance to test it this morning.

Any ideas what i'm doing wrong??? Seems like I'm missing something. There is no way i should have a CC reading of 3 on a fresh fill in a clean tub.

 

[mas985]

Most tap water has fairly high CC so you might want to measure that to see if that is the source. However, that should disappear over time. The other possibility is bad reagents.

 

[Razorhog]

My only guess is that it still isn't clean somewhere in the plumbing or something.

 

[kris77]

Reagents are brand new this year. Pool doesnt show any CC. So i think the reagents are good.

I'll have to do some more testing when i get home and try and find the source.

 

[ant 83]

Did you remember to remove the filter during the ahhsome treatment?

Have you cleaned it since?

What temp is your tub at?