Clear, but no chlorine???

[BigDave]

As long as it has pool water flowing through it, I wouldn't worry about it.

[mary jo]

So continue to keep the pool at shock level- 30- and see what happens to the CC.

btw: the skimmers again have a very thin line of sticky, greasy, black stuff around the waterline. I was going to wet a cloth with chlorine and wipe. Never had this before last Sunday.

[BigDave]

The shock seems to be working, I wouldn't stop now. Like PoolDoc said - clean that goo off while you can.

[Watermom]

Might try using a paste of baking soda and water to scrub it with.

[JimK]

So continue to keep the pool at shock level- 30- and see what happens to the CC.

btw: the skimmers again have a very thin line of sticky, greasy, black stuff around the waterline. I was going to wet a cloth with chlorine and wipe. Never had this before last Sunday.

I occasionally get the same black goo in the skimmers. I just clean it off when I notice it. It's been happening for years, but I've never notice a negative impact on the pool from it.

[mary jo]

A big thank you to FormerBromineUser- yesterday I got a "house call" from her to look at my pool - an extra pair of eyes might help. Everything that could be cleaned was cleaned EXCEPT----when I turned the in-line chlorinator OFF several weeks ago, I forgot to take the pucks out! Luckily FBU caught this and the petrified pucks (about 6 of them) were removed and the empty tower cleaned (with hose water). There was a rust-colored looking stain on the tower walls, a bit of sediment on the bottom, so I soaked it w/ hose water and sprayed it out w/ the hose on jet spray setting. It does look much cleaner and water in it is clear, so I turned it on just a bit to let water trickle thru it- there's no shut off value for the chlorinator and Nature2 unit (which are located next to each other on their own line).
Not sure if that was a contributing factor, but it's now empty and clean.

Numbers:
Yesterday FC went from 30 to 27 (dawn to late afternoon) so I added about 1/2 jug of bleach.

Last night tested @ 8:30pm FC=30 CC=2.0
This morning tested @ 7:15am FC=29 CC=2.5

I didn't get to the brushing yesterday- will do it today.

[BigDave]

Sounds good, 0.5ppm is the error in the test so those readings are pretty much the same. Have you had any sun?
I'd like to try a little experiment If you'll indulge me. For the next FC/CC test, use two dippers of DPD powder. Post any observation you have about the test.

[mary jo]

Yes, we had lots of sun yesterday, and today as well (so far). Should I do the 2 scoops when I test this afternoon or wait until this evening?

Also, a question: my husband is coming back in town and has already asked me if he can swim tonight. I now know (and now he knows) it's safe to swim @ FC30, but will it mess up the FC/CC levels if he does? I'd rather wait until we're in the clear- POP, right- but wanted your opinion on whether this would set us back any.

[BigDave]

Go ahead and swim - in an old suit. Next time you test, I'm curious if you'll see a difference at 30ppm FC.

[FormerBromineUser]

Just sterilize the hubby before he jumps in!