How long should it take to clear black algae

[Watermom]

Thank you, Yeggim for supplying the needed links for this member.

Joecus --- thank you for your interest in making a donation to the Forum. It will be most appreciated!

Glad to hear of the overnight results. That is good news!

[joecus]

Hello all, I'm not sure if this is normal so here is my question. I am no longer using chlorine at night, very steady. During the day, my CL goes from 10 down to .5 or 0. Any thoughts why?

Also, how long do you guys run your filter under normal conditions? Just let me know how many times water should filter and I will do the calculation based on my filter. I appreciate your time, Thank you.

Watermom, My spa is 540 gallons and has a bromine cartridge. Your point still applies. The bromine cartridge are very expensive but I guess I will stick with this system. It works pretty good but I was thinking about saving a few bucks. I've read that you can easily change from CL to BR without any issues, but cannot do BR to CL. I don't understand why, but that seems to be the consensus. So, I'm going to get the ph up to normal levels, stabilizer up to 10, then switch to the bromine. I know this is not your area of expertise but please let me know if my plan sounds plausible.

[PoolDoc]

Hello all, I'm not sure if this is normal so here is my question. I am no longer using chlorine at night, very steady. During the day, my CL goes from 10 down to .5 or 0. Any thoughts why?

This is characteristic of low CYA *or* added bromines.

[joecus]

Thanks Burfle,

Please help. As some of you know, I ran out of taylor r0013. I am no longer losing cl at night. During the day, cl goes to zero. Here's my Here is my dilemma, The strips show my cya at zero. My last known reading with the Taylor kit was about 70. I believe my stabilizer is gone. I have 40 lbs 3" tabs on hand. I have a box of Pace Clear shock treatment, (99% sodium dichloride) and about 2 pounds of “chlorine stabilizer (2,4,6 Trihydroxy-s-triazine). Should I go buy “bromide”? Or do something with the stuff I already have? Please get back to me, my son wants to use pool and I don’t know if I should let him.

[PoolDoc]

I'm getting confused; I don't know whether you are talking about the spa or the pool. Please go through the thread, and list the number of the posts (yours and other posters) that refer to your SPA. I'll split them off into another thread. (For example, this is post #45.)

[joecus]

Sorry about that. I'm talking about my pool. I'm losing CL during day only. I have the items listed above, tabs, stabilizer, and shock. I switched to BBB and I have this leftover. I suspect I have no stabilizer due to the daytime CL loss and the test strips stating it’s zero. I’m hesitant to use tab, stabilizer, and shock that I already have. I’m hesitant because I don’t trust the strips. I cannot get a good cya reading because I ran out of the Taylor Kit, r0013. I ordered more but it has not been delivered yet. The last Taylor cya reading was 70. This was 2-3 weeks ago. The strips are telling me there is no cya, which would make sense. I don’t know if my stabilizer can drop that much, so I am skeptical of the strips. If you tell me, cya can drop that fast, I need to add stabilizer. Should I use what I have on hand or go buy bromines?

[PoolDoc]

The only two ways I know for stabilizer to disappear are to drain the pool OR to experience a major 'slime-out' with algae and bacteria.

As best I can tell, you haven't drained, and you haven't had a slime-out since you last tested. So?? I don't know.

Possibly, either your original tests OR your recent ones were wrong. But the lack of chlorine loss during the night, with chlorine loss during the day, suggests no CYA, but also no residual ammonia from a 'slime-out' eating the stabilizer.

I don't know where your stabilizer went, but it seems to be gone. Go ahead and use what you've got, and the tabs you've got.