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oops, I meant to mention a free photo hosting site like photobucket.com :smile:

Any spike in the FC or pH can cause the copper/metals to fall out of suspension and can create a stain. Have you had pH spikes? (sorry if I missed this) As you know, pH control with SWG is more difficult to keep under control.

Copper levels above 0.3 tend to cause stains. You can use a fee photo hosting site to post more pics. How old is your pool?

If copper is attached to a pool in the form of a stain, it may not show up in a water test. Some tabs do contain copper. Let us know what happens with the dry acid approach. This is the correct RANGE of suggested #'s, based on surface type. The FC is based on the CYA. 4 FC is minimum for 50...

:scratch: Copper stains? Try some dry acid in a sock on the stain for a minute or two and see if it lightens. Have you used anything that would add copper to the pool?

But, the minimum FC with CYA of 50 is 4, not 3. The 4 to 8 is the FC range suggested by PoolMath. with Bleach FC 3-7 (See chart) http://www.troublefreepool.com/content/128-chlorine-cya-chart-slam-shock pH 7.5-7.8 TA 70-90+ CH 250-350 CYA 30-50

You need another brush for the plaster that is over a year old: Running the FC at the minimum and sometimes allowing it to dip below minimum can create conditions that allow black algae to get a foothold. Not saying for sure that you have BA, just another piece of info. I suggest you try...

What type of brush are you using? Has your CYA been allowed to get higher than 50? Has your FC stayed close to 4 or maybe even dropped below? Have you rubbed a trichlor tab on a stain/spot to test if t is organic?

I think you misunderstand the OCLT. This is what you should do to rule out/in organics: http://www.troublefreepool.com/content/136-perform-the-overnight-fc-chlorine-loss-test-oclt

When was the OCLT? The spots look organic to me. You might want to send a PM to poodlegirl and ask her about her experience and if she has pics.

Thanks! Are you brushing? Still sounds organic to me. What about an OCLT?

Interesting.....this sounds like organic stains. Please retest with the TF100 and post results. Your CC test is especially curious.

Re: Removing a small rust spot from new pool How much staining? If you have a small amount, you can crush some cheap vitamin C (ascorbic acid) tablets in a sock and rub it on the stains. We love pics :D

Sorry this post was missed! I suggest if the TA is at least 60ish and the pH is between 7 & 7.2, you can go ahead and slowly add FC. Aim for 2ppm FC. You could test every hour or so to see if it is holding. If not, add enough to get to 2FC. All the while keeping an eye on the stains to see...

I also agree that you should do an OCLT to rule out/in organics. Get the pool clear and then increase the CH to recommended levels. from Pool School: Welcome to the forum :wave:

yep, that is a side effect of adding soda ash (pH Plus). You can calculate how much TA rise from pH-up additions by using the PoolMath Calculator "effects of adding chemicals" located near the bottom of the calculator. One pound of soda ash (in your pool) will increase TA by 5.7 :shock...

Re: CYANURIC ACID (CA): The Great Debate ::epds:: Moving to the deep end :snorkle:

If it was my pool, I'd raise FC up near to target now; and, tonight raise to SLAM level and do an OCLT. Noticing a smell (or a dull look to the water) is one of the first clues that something is amiss.

:nopic:

Maybe a kind of pre-filter in the skimmer basket could help remove some metals? Do a site search (top right) for "paper towel method" and see if that might give you some ideas. Dealing w/metals, as you know, is going to be an ongoing problem requiring maintenance doses of sequestrant.

I suggest you uncover it for a few hours every other day or so and let it breathe. It could be that the FC dropped below minimum at some time. Also, the water is warmer & the pool is being used = more chlorine demand. Probably just keeping the FC at the upper range would cure that problem...

Did you do the OCLT? You have cloudiness and the chlorine demand has doubled. I suggest the SLAM process. Nip it in the bud! Are you keeping the pool covered?

You probably need to do the SLAM process. You can go ahead and get to SLAM level FC and do an OCLT test tonight. That will rule out/in organics. If it turns out organics, which I suspect, you will have a jump on the process.

:oops: Yep, you are correct. I corrected my post, thanks :smile:

Jason gave the best answer to your question. With 40 CYA, keep the FC between 3 and 7, and never below 7 3. When you dose the pool, aim for 7 FC. Wait 30 minutes and retest to make sure you hit target. 24 hrs. later, retest and adjust back up to 7. Notice your FC is 2 in the first post...

Well, lots! What is the CYA level?

The best thing to do is replace the water with water that does not contain metals. Sometimes that is not an option. As long as the metals are dissolved in the water you can not remove them. Raising PH and adding chlorine will both tend to cause the metals to come out of solution, however...

Welcome to the forum :wave: You could use one of the recommended sequestrants. Here's an article: http://www.troublefreepool.com/content/137-metals-in-the-water-and-metal-stains

:goodjob:

dcwest, welcome to the forum :wave: If you want to take control of your pool, you should order one of the recommended test kits. This is the best investment we made in our pool. http://www.troublefreepool.com/content/124-pool-test-kits-comparison The best bang for the buck is the TF100...