black algae

Hello.... the perfect storm has occurred and I am now realizing I am starting to have a black algae problem in my pool. I started seeing some black colored build up on some tile grout lines and finally took one chunk off and smeared it onto a towel, which turned green. I noticed a couple of...

Hey Everyone, I know there are a lot of threads on this already...just looking to see what your thoughts are. At the beginning of July, I had metal stains on the floor of my vinyl liner (liner is old....8-12 years). Yes I plan to replace it. So I used a chlorine neutralizer and citric/ascorbic...

I have a pretty bad black algae infestation right now. I’m tackling it with the pressure washer one square at a time.

Does a 200 ppm CYA level invite Black Algae? Seems like I can't keep a high enough chlorine level with this high of a CYA. Black Algae is mostly on the walls with some now spreading down the deep-end walls and a just little on the bottom. To find the 200 ppm CYA value, I used the Pentair Rainbow...

First post, but visiting site for some time now. I have learned a lot from TFP. Location: Fort Lauderdale Problem: Black Algae Pool Size: 19300 gallons Test kit: TF-100 Salt water pool Plaster pool - I got my ph to 7.4. -Did a cya test and reading came back at 15. I started adding cya thru...

New-ish pool owner here and having trouble getting rid of black algae. (Or so I think it’s black algae). I’ve followed the steps of getting my pH down, super chlorinating, and then scrubbing the spots with a wire brush, but they keep coming back or don’t disappear entirely. I use a Taylor...

Heyo, I'm a long time TFP lurker! I've drunk the Kool-aid, bought the test kid and preached the TFP gospel to all the pool owners I meet. But, alas, the dreaded Black Algae set in last year. Our plaster pool (15Kgal, pic attached) is LOOONG overdue for a redo; it's pitted and pocked and...

Hi Everyone, I'm brand new to pool ownership and we noticed that when we opened the pool for the first time, there were these black stains scattered around the bottom and sides of the pool. The pool is a salt water pool and has a vinyl liner about 7-8 years old (I've been told). The previous...

Hi guys, I need some serious guidance here.. my pool installer did a terrible job installing our waterline tile on our saltwater fiberglass pool which we installed last fall. What seemed like just a sloppy install is not turning into a algae borne mess... it seems water is now behind lots of...

I have a 10,000 gallon fiberglass, salt water pool with tile at the waterline. I don’t have any issues in the pool, just stubborn algae in the silicone that holds the tiles. I’ve tried scrapping is with a razor, spraying chlorine, chlorine tablets. Nothing works. In the first couple years I had...

This is my first post, and I can’t tell you how thankful I am for this community. We had some algae and started a slam. Usually, the slam clears everything up, but there are some stubborn black stains. I think it might be black algae and have been brushing it a few times a day with a steel brush...

I had redone my pool about 10 years ago and gone with a small pebble tec finish that had the longer 30 year guarantee. One of the reason I went with the pebble tec, is because the old pool had black algae when I moved into the house and I thought that the coating would prevent black algae in...

I have been mostly lurking on this site and it has been an amazing boon to someone who knew nothing about pools/maintenance just a few years ago. Thank you to everyone for the great information and discussions. So I have been able to bumble along fairly effectively and maintain my pool for the...

It's time to replaster our 23 year old pool. In the past 5 years, black algae has been a problem. Have gotten several quotes to re-plaster. I really want the same solid white plaster that has been used for years but I have been told that the plaster today is not the same formula and that the...

Hi all! I’m looking for some help. We had a pool installed this past May, so it’s only 3 months old. It’s a 21’ above ground salt water pool. Everything has been going great until one day I was vacuuming the pool. I hadn’t vacuumed in like a week because it was a busy week. While vacuuming, I...

Hey! I have some Brown Algae in my pool that doesn’t brush off easily with a nylon brush. It has a slimy consistency and proliferates upon low chlorine and reduces when I shock the pool. The guys at two different stores said they’d never seen something like it. They recommended treating like...

I was out of town last week, during which my chlorine levels dropped to zero (poor planning on my part) and we also had torrential rain. When I returned home to Hartwell, GA, I was greeted by a pool that looked more like a pond - specifically it had green / yellow algae all over, along with...

I have been dealing with these hard white/grayish spots on the bottom and walls of my concrete pool. I am in the middle of a SLAM/MUSTARD algae shock as we speak. The reason for this is that I did also have some issues with algae. I recently connected new Intellichlor salt water system and...