New BBB User

[PoolDoc]

Yes, there were some bumps moving from there to here -- most of the attachments got disconnected

Anyhow, there are two likely possibilities with your CC.

=> First, you could be making a testing error. But if you are using the K2006 and ONLY the DPD drops + the DPD-FAS drops, and have pre-rinsed your tube, it's hard to make that sort of error.

=> The CC could be real. If so, get some borax, and raise your pH! If it IS real, and isn't stinky yet. Also, do NOT cover the pool -- the chloramines leave as chlorinated gases, and can damage a cover. If they are real, it will take time, sun, and quite a bit of chlorine to get rid of them. Don't work about the break-point calculations -- there are only few situations where those calculations actually apply, and most of them are NOT in pools!

More info here:

http://www.poolsolutions.com/gd/spri...-problems.html

Ben / PoolDoc

[knightoj]

To make sure I get this right. I should raise the PH level and then raise the Chrlorine levels each night, check it in the morning, raise the chlorine level if needed until the CC goes away. Should I raise it to the shock levels from the Best Guess Chart? Thanks for your help.

[PoolDoc]

That's it, exactly.

But let us know if you do NOT see chlorine levels dropping overnight.

Ben

[knightoj]

I've go it to the point where the Chlorine levels are consistent from the evening to the morning. Last night, I upped the FC level to 17 and this morning it was still holding at 17. CC is still at 3.5. Do I continue with the process and then the CC will eventually go away?

[PoolDoc]

Ok, you've made progress. But it's still not clear to me what the source of the problem was. Please read through this PoolSolutions page, and see if anything jogs your memory:
http://www.poolsolutions.com/tips/wh...sappeared.html

Ben / PoolDoc

[knightoj]

None of the things mentioned in the link apply to my situation. It is very windy right now with a lot of dust blowing around right now. Could that be a cause? I also just switched to the BBB method after using Tri Chlor tablets until about three weeks ago. Thanks for you help.

[PoolDoc]

There are two ways to end up with high persistent combined chlorine (CC) in your pool:

1. Add nitrogen into the pool in a form that can react with chlorine, OR
2. Put something in the pool that screws with the test.

In the first category are things like:

• foamy algicides
• granular algaecides based on ammonia
• degraded stabilizer (ammonia, again)
• urine or lots of sweat
• some fertilizers
• other stuff I haven't though about, or heard of

In the second category, there are several possibilities but "oxy-shocks" or "non-chlorine shocks" based on potassium monopersulfate stands out. MPS will test as CC, even though there's no chlorine in it, and it's completely ineffective as a sanitizer ( unlike combined chlorine).

Of course, I'm sure there are possibilities I don't know about.

But, if you can't think of any one of those that might be the explanation, it's probably best to simply hang on, and see if the problem resolves itself.

Oh, just to rule out one more possibility: exactly what test kit, and what test method are you using to test for chlorine?

Ben / PoolDoc