How long should it take to clear black algae

[joecus]

Hello all, I've been keeping the CL very high yet I'm not seeing progress. How long can I expect this to last? What about raising the CL really high, (50-60 no swimming) will that resolve my problem faster>

[madwil]

not sure if I'd go that high- but super shock level is 75 for your CYA range, so it should be ok- maybe Ben or someone else will be in later to advise you...

[Watermom]

Madwil -- your post doesn't make any sense. He is wondering about taking the cl really high -- up to 50-60. You tell him you're not sure if you would go that high, but 75 should be ok.

joecus --- I did not see (unless I missed it) where you told if this was a liner pool. But, do NOT take the cl up to 75 unless Ben recommends that you do.

Are you consistently keeping the cl at shock level? If not, letting it yo-yo up and down will make it take forever and a day to clear. Are you brushing the sides and floor?

Go ahead and post another set of numbers since it has been a couple of days since you have done so. Are you running the pump 24/7? Is your filter pressure rising? How does the water look?

[madwil]

my post wasn't supposed to make sense- why I stated that hopefully someone else would come in to advise; I wouldn't want to go to 50, but the supershock says to... if Ben told me to, I'd probably do it, but would sit on nails waiting for results!

Weird, since I have no issue at 30-40 ppm chlorine, I guess 50 is just my "shutdown" number...

[joecus]

Hello all, I've been checking 3 times a day and adding bleach when necessary. It comes to about 2 gallons a day. My pool is 12k gallons. My numbers right now are as follows:
fc = 33
tc = 33
cc = 0
cya = 60
ph = 7.8

Let me review my formula with the group to make sure I'm doing it correctly. I'm taking 6 parts tap water to 1 part pool water. I get a cl level of 2. 1/6 * 2 = .33. The ph and cya are done with pool water only. It's been varying from 33 at night to 15 in morning. Any ideas? Water is crystal clear. What is the significance of zero CC? Thanks for any help, I really appreciate it.

[Watermom]

You should be multiplying that result by 7 which would be 14. Read the guide at the following link:

http://www.poolsolutions.com/gd/how-...d-testkit.html

Since your CYA is 60, you should be shocking up to 20. So, you need to go a little higher with your chlorine. You're not quite getting it to the point to do the job. In your pool, each gallon of 6% bleach will add 5ppm to the water. When you test 3x per day, are you adding enough bleach to get back to 20? If not, start doing so.

Regarding CC --- you WANT it to be 0.

[joecus]

Sorry, I wrote the wrong computation, I am multiplying by 7 and getting 14. Normally I take 3 parts water and multiply by 4. Today I did 6-1 and used a calculator and messed it up, So My number is 14, not 33. I will raise it up to at least 20 for the next three days and see what happens.

[joecus]

Hello all - I'm still having the same problem. At night, I bring my cl up to 40 or above, by morning it's about 20. I then bring it back up to 40, by 2 pm it drops to about 20, I bring it back up to 40, by 8pm I'm back to 20. This has been going on for at least 1 week. I'm using 10 - 12 gallons of bleach everyday. I added the bioguard algae 60, 5 days ago and yesterday. Is there anything else I can do? No one has been in the pool this week. When I see the algae I brush it off. Any help would really be appreciated. Joe