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The CYA test is the hardest to master. You can pour the solution from the sight tube back and run the same test multiple times. Make sure you are doing it in full sun with your back to the sun. I don't even bother testing on a cloudy day.

There really is no such thing as "locked" or "chlorine lock" your chlorine needs to be high enough according to the CYA chlorine relationship at all times to prevent algae. So at some point yours must have dropped too low for your CYA. You will need to follow SLAM process. But first, can...

Primuspaul, Despite the efforts to point you in the right direction regarding the ABC's of pool chemistry you seem to continue to want to compare liquid chlorine to stabilized dry products. By price per pound, you are comparing apples to oranges. They aren't the same. If you want to post up...

Primuspaul, Post #10, I tried to explain the dry chlorine vs liquid. The CYA or the calcium added by dry chlorine types are not "consumables"..........they DO NOT dissipate in the pool without draining water.......eventually causing problems for most. Of course, in a climate more northern...

Dry chlorine is always stabilized by something. Calcium hypochlorite (cal-hypo) is stabilized with calcium. Dichlor and trichlor are stabilized with Cyuranic acid (cya). Both are substances that can build up in your pool and have undesirable effects. This is why we mainly reccomend using liquid...

Welcome to TFP :) This is exactly why we teach that learning to test yourself and trusting your results. It isn't any use comparing your results to the pool store results. Unless you just want to see how inaccurate they are ;) As already advised, read up in pool school and post your questions...

Hey Bob In reading through this, you say you're bringing your FC up to shock level and brushing when you do. Are you elevating your chlorine to shock level for your CYA when you see algae or are you following through with the whole process of removing algae? We say SLAM Shock Level And...

Hi Frezel, The idea behind SLAM is to keep your FC at shock level for your CYA until all three criteria are met: Water is clear Overnight FC loss is 1 or less CC is .5 or less

Hi there. You get algae when your chlorine is too low for your CYA. SLAM is an acronym: Shock Level And Maintain The idea is to keep FC at shock level for your CYA until all three of these criteria are met: 1. Water is clear 2. Overnight chlorine loss test shows 1 ppm loss or less 3. CC...

Hi :) Welcome to TFP You can find extended test kit directions that should apply to the Taylo FAS-DPD chlorine test here: Pool School - FAS-DPD Chlorine Test Cloudy water when brushing is an indicator of algae dead or alive. Brush as often as you feasably can. Algae developed a biofilm that...

Hi Hiesman84, That last pic looks like a fine algae bloom to me. Have you read up in pool school? You will want to follow the SLAM process to clear that up. Pool School - ABCs of Pool Water Chemistry Pool School - SLAM - Shock Level And Maintain

Hi Bbp, Have you read through the article on black algae here: Pool School - Black Algae Have you ruled out the potential black algae false alarms? This is a good read as black algae is kind of a different beast than the regular old green algae.

Hi Gabrielle SLAM is a process. Shock Level And Maintain To clear the pool, you need to follow that process which is to bring your free chlorine up to shock level for your CYA level----see this chart for that target. https://www.troublefreepool.com/content/128-chlorine-cya-chart-slam-shock...

sumosteve, I'm still leaning toward algae. But.....having tried vitamin C tablet with no results, have you tried a chlorinating puck? Like dichlor to trichlor? Held on the stain or rubbed on it? If that clears it, again, more evidence of algae. I have seen few and far between stains (not...

Sumosteve, Your chlorine is currently too low for your CYA so again, I'm going with algae since you're low chlorine is an invitation for algae. Despite the others chiming in, I'm very suspect that these spots are algae, especially since you say the brush off. Have you read up in pool school...

Welcome to TFP:) I suspect algae. Can you share your most recent test results? Like this: FC CC PH TA CYA How you you chlorinate?

Definitely sounds like algae to me. Measuring low CC doesn't necessarily mean you don't have algae present. Follow the SLAM process. Pool School - SLAM - Shock Level And Maintain Shock Level And Maintain You'll need to keep FC up until all three criteria are met (not just one or two) 1. CC...

HI Ericwood. Welcome to TFP :) Sound like you are on the right track. If I read correctly, you added enough CYA to get to 30? Have you been able to measure CYA? I'd go with liquid chlorine only and stop with the cal hypo. You need to be shooting to maintain FC at 12 IF you are at 30 CYA...

HI. Welcome to TFP :) Can you tell us the state of your water? Current set of test results from a reliable test kit? Here is some reading in pool school. Read and ask questions :) Pool School - ABCs of Pool Water Chemistry Pool School - Chlorine / CYA Chart Pool School - Test Kits Compared...

:). Uhm......don't respond? Do they ever swim in lakes or ponds?

Ok. Sounds like you may have something in your water and your chlorine is too low. Have you had the chance to read any articles in pool school? Check that out. To rid the pool of any algae, you'll want to follow the SLAM process Pool School - SLAM - Shock Level And Maintain

Welcome to TFP :) Can you tell us how you got those test results? No test I'm aware of the we like to see results from can read CYA of 15.

Yes. It will raise your CYA. Where is the CYA now? Also, you can use the link above to pool math and at the very bottom, you can calculate the affects of adding different chemicals to your pool if you put your pool details in.

To get rid of algae, you need to follow the SLAM process. Pool School - SLAM - Shock Level And Maintain You also need to be able to accurately test your own water to follow that process. Pool School - Test Kits Compared Can you tell us how you got those test results?

Your chlorine is too low for your CYA. To rid yourself of algae you should follow the SLAM process Pool School - SLAM - Shock Level And Maintain And the you'll need to be maintaining higher FC level for 70 CYA Pool School - Chlorine / CYA Chart

Welcome to TFP Abbytheo :) As an anecdote, my setup isn't too different from yours. I've followed TFP since less that a year after install but nonetheless I let it go over the winter. I thought I'd be smarter than the algae and vacuum what had accumulated to waste. Wasn't helpful and backfired...

I know I've said this many times on the forum but the algae does indeed hide in seems around steps as well as just inside the skimmer box frame and I've seen it in the foam on the weir door. Yes my pool has gotten that bad. But.....what I do is give my kids a plastic kitchen brush and ask them...

Without a full set of reliable test results, it's hard to say. Since you drained, it could be that your CYA is too low or non existent? To help hold chlorine.

HI there, are these test results from a good reccomended test kit or the pool store?

What is your CYA level? Definitely sounds like the start of algae. The SLAM process is what you'll need to follow for algae. Pool School - SLAM - Shock Level And Maintain