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They don't have anymore because I grabbed the last few bottles. :)

Hello and thank you for posting on TFP. :wave: I'm going to tag @JoyfulNoise for some assistance on this one. Have a nice day.

I do live near that Cibolo location. Last I looked they had a couple dozen on the shelf. You might also check Home Depot as well. Last but not least, if you simply can't find any good stuff, check your local pool store. They might be a buck or two more, but it's usually fresh and should last...

That's fine. Regular/plain, and as you stated, avoid anything that says low splash or scented. Frustrating they are selling smaller bottles for the same (or higher) cost. Interesting, our Walmart's shelves are full of Pool Essentials. I guess each location can vary. Have a good afternoon.

Aloha from the mainland and welcome to TFP! :wave: Any chance you could post a pic or two of the spots? Could you also update your signature with all of your pool and equipment info as well please? We'll do what we can to help. https://www.troublefreepool.com/blog/2019/01/18/black-algae/

I wouldn't worry so much about phosphates. They don't have much significance in algae-free water. A DE filter won't remove iron. But once you do the AA treatment, you will want to exchange the water if possible to actually remove the iron that will be in suspension. Taking advantage of the...

jf, are you saying that you are letting the levels fall in preparation for an Ascorbic Acid treatment? Do you know how you got the rust stains, and are they wide-spread all over?

"G", hello and welcome to TFP! :wave: Not so sure that's MA this time of year. Being grey in color, it may just be dead algae. But I'm going to post a some links below which may help. I really encourage you to look at the Pool Care Basics page below, and pay particular attention to the test kit...

Yeah. we finally got a taste of winter today. Burrrrrr.

Alright! :goodjob: That's promising (organic). Better than heavy calcium scale. So now it's time to review your own FC/CYA, but not with Leslie's or any other source. You still have your TF-100 correct? That's the best way. The CYA test may be tough to do if you have bad weather (cloudy)...

"IF" it is indeed from scale, it may have slowly developed over several months (or seasons) if the pH got too high couple with warm water temps. Sometimes scale can trap organic material in it as well which can add to the discoloration. But see if the puck does anything. If not, we'll o from...

If the brushing has no effect, the Vitamin C did nothing, and the elevated chlorine seems to be staying still with no drop, I have a suspicion you may have some calcium scale staining. Calcium scale can sometimes present itself in a dingy yellow color. Are you brushing with a steel brush...

Hummm. Not seeing all the test results you mentioned. Only the CYA, pH, FC, and CC. The CH and TA would also be good to know. The fact the yellow doesn't move when brushed tends to seem like it's not algae. The Phos-Free stuff is no issue. In fact, you don't really need to buy that stuff...

You are correct. But Blue Whale is just the company's name, unlike the Clorox Blue products for example. I can understand why you'd say that though. But I used that brand when I was manually chlorinating with no issues.

If I recall correctly, the Blue Whale liquid chlorine is fine (sodium hypochlorite). I was glancing at your other thread about green water (I'll combine the two), by any chance are you using well water?

I also forgot to mention earlier that you didn't post your stabilizer (CYA) level. That's important for a couple reasons. First, to avoid algae down the road you want to keep the FC balanced to the CYA as noted on the . The other reason is that stabilizer is very important to serve as a...

If you search our forum for chalky sides on Fiberglass (FG) pools, you'll two general responses - those whose wiped-off easily by hand and those whose seemed embedded and had to be aggressively removed (like mine). In most scenarios, the reason was unclear. In some, chemistry did in-fact play...

I built a water garden a few years ago and stocked it with large goldfish. The water used its own ecosystem and filtration (through moss and such) to keep the water crystal clear. SImilar to what you have going on there. That did not mean however that it was sanitary for human use. I suspect...

The is a great tool, but once in a while we rely on other indicators to be sure - like CC level and water clarity. Question though - your signature shows 1,700 gallons. Is that a typo, or is your pool really that size? Also, can you post a full set of water test results?

I wouldn't worry about trying to shock that small amount remaining. You're going to store it anyways. Just empty it completely. Once the entire pool is void of water and that residual green stuff, give it a final good wiping-down with a mild mixture of clean water and bleach, then let it air...

Finding that small jackpot might help turn that around. But also be sure to look anywhere else that algae can hide. Where there's one spot, there could easily be another. Hopefully not, but you never know.

It's a good catch. :goodjob: Sure appears to be some organic junk. I'm sure that was hurting your FC.

Has a bit of a sludge appearance. Does it wipe off easily? Does it look green on a paper towel?

So you're taking the whole pool down huh? In that case, I wouldn't fill it back up. I'd just let it drain. Give the liner a final scrub & rinse. If you're able, perhaps hit it with a mixture of bleach and water (4:1 ratio should be enough), brush, then rinse well and let dry before putting...

Stains in a line huh? Won't budge with brushing? Maybe post a pic or two so we can see it?

Don't let the clear water fool you. Inheriting a new pool with unknown chemical history can play havoc on your chemistry. Losing 10 ppm each day is quite a drop, and it may not all be algae-reated. The key here, especially in the early parts of this , is to test a little more frequently than...

Welcome! :wave: While you appear to have passed an OCLT, mustard algae (if that's what it is) can still present a problem if not treated correctly. See the link below. Before we go too far down that road though, please clarify what test kit you are using and add it to your signature for...

It looks like it could be Black Algae. You should dive down there and try to scrape some of it off with your fingernail and swipe onto a white paper towel. If it is BA, it will require an elevated SLAM level coupled with some consistent brushing to break-up the algae spores of the BA and allow...

Sorry to hear about the recurring algae problem. Like a bad Groundhog Day scene. Well, perhaps the first thing to do is try to confirm (physically) if that stuff is indeed algae. Are you able to grab any of it with your thumb and index finger? Or does it dissipate as soon as you try to get...

Not positive, but those look like the smaller lights that don't have a full niche behind them like the larger lights. Maybe someone else will reply to confirm who has those lights. If not, I'll ping one of our build experts to see. Tag me back if you don't get a reply soon.