Filter not doing the job?

[gogolion]

Since I had to go to the pool store to get DE powder anyway, I decided to bring a water sample and have it tested. Now I'm thoroughly confused. Some of their measurements don't match mine at all. They say their test equipment uses lasers so its accurate, which I thought was funny. I'm going to take what is leftover of the sample and retest when I have time later today, but here is what they got that didn't match mine at all.

FC = 5.13 (I tested it at 16 4 or 5 hours ago)
CC = 0.07 (I tested it at zero)
CYA = 10 (I tested it at 40 this past Saturday)

Here are the values that more or less match mine:
Ph=7.8 (I got 7.7 this morning)
TA=168 (I got 160 a week ago)
CH = 163 (I got 140 a week ago)

Their suggestion was that I should add a half gallon of muriatic acid to bring my Ph and TA down. They say high TA could cause the cloudiness in my water. Should I listen to them?

I'll report back after I test the same water sample as the store.

[PoolDoc]

Thanks for that set of comparison numbers! We often here of the discrepancies, but don't often get exact numbers.

The results are actually better than what we often hear about. The prescription isn't nearly as bad as some. And, actually, the CC value should be considered equivalent as well. On the other hand, the CYA and FC errors are pretty serious.

I'll go this far: get a gallon of muriatic acid, read the muriatic acid handling guide linked in my blue signature box, and then go ahead and add it, but only 1/4 gallon at a time -- and test the pH 4 hours or so after the addition. Adjust your pH down to 7.2 - 7.4. With a TA = 160, it's going to tend to drift upward. You don't want it wandering way up there, while you are trying to get rid of algae.

By the way, transporting a sample can cause values to change, especially if it gets hot OR if there's any air space in the bottle.

[gogolion]

You're right, the CC is virtually the same. I initially was listing all the values, but then decided to separate them and forgot to move that one. The sample did not get hot (it is a mild, cloudy day her in the Chicago area), but there was a bit of airspace. I retested the same sample and got 13.5 for my FC level. I did not retest Ph since it has been steady at 7.7 for the past week. I happen to have a 1/2 gallon of Muriatic Acid so I'll add some and retest later. After testing the sample at 13.5 I also added 2 96 oz. bottles of bleach (walmart was out of the big bottles). I'm going to retest my chlorine in a little while and add more if necessary.

[gogolion]

I just tested my water for the night. FC=17, CC=0, PH=7.2. I'm leavng it alone and will test again first thing in the morning.

[gogolion]

This morning FC=14.5, CC=0.5, Ph=7.2. Gotta run and get some more bleach. So I lost 2.5ppm of chlorine. I guess this means the algae is not dead yet, huh?

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I was just doing some more reading and came across the sticky about mustard algae. I'm starting to think that is what I have. It is a thin film of "dust" that reappears every day. You don't even really notice it unless you let it build up over days or if you brush it, then it becomes a cloud of dust. The color? I'm not sure. It's sort of green, sort of brown, maybe yellow? It's definitely not a bright breen. My high chlorine levels don't seem to be killing it. Is this what I could be dealing with here?

[PoolDoc]

came across the sticky about mustard algae. I'm starting to think that is what I have. It is a thin film of "dust" that reappears every day. You don't even really notice it unless you let it build up over days or if you brush it, then it becomes a cloud of dust. The color? I'm not sure. It's sort of green, sort of brown, maybe yellow? It's definitely not a bright breen. My high chlorine levels don't seem to be killing it. Is this what I could be dealing with here?

With a CYA at 10 - 40 ppm, if you chlorinate to FC = 20 ppm daily, and brush after each bleach dump, it should clear up after couple of days. CONTINUE to chlorinate that way, for several days AFTER you no longer see any trace of it.
Sure sounds like it.

[392papa]

I feel your pain,,,,Although I am not an expert like many of the people who are helping you here with the chemical advice. I will say this ...I have way to much experience cleaning up dead algae with a poor working sand filter from the days before I joined the site.

I have found that turning the filter off for a few hours and vacuuming to waste helps get rid of the "dust'. Also when I have the fine dust in my pool I use "skimmer socks' on my skimmer basket. They are expensive and a pain,,,sometimes i would wash them out a couple of times a day. They do seem to help get rid of the small particles.

If you figure out whats wrong with your filter let us know.

Good luck!!!!

[Spensar]

Also when I have the fine dust in my pool I use "skimmer socks' on my skimmer basket. They are expensive and a pain,,,sometimes i would wash them out a couple of times a day. They do seem to help get rid of the small particles.

fyi, found a 10 pack for $9.75 on Ebay, $3.50 shipping.

[392papa]

thanks I'll check them out!!!

[gogolion]

Thanks for the advice. I'll look into skimmer socks. Regarding vacuuming to waste... it takes me a couple of hours to vacuum my pool. That is a LOT of water to be dumping, isn't it? Seems to me I'd have to be filling at the same time and probably wouldn't be able to keep up.