black algae

  1. T

    Black Algae Help

    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...
  2. gkl

    Preventing Black Algae Return After Resurface

    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...
  3. J

    Help - Black stains on my vinyl liner - not coming off! Fear it's Black Algae

    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...
  4. L

    Please Help!! Terrible tile install with algae growing behind it!

    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...
  5. K

    Black Algae Above Waterline

    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...
  6. K

    Is this Black Algae?

    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...
  7. C

    Black Algae - Pebble Tec Pools

    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...
  8. S

    4 years in and still have a lot to learn - I have an old pool and need some advice

    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...
  9. L

    Black algae in 23 year old white plaster

    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...
  10. Jilliebean3590

    Does this sound like black algae?

    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...
  11. G

    Unusual Algae - Please help

    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...
  12. B

    Considering trying In The Swim's Black Algaecide...am I crazy?

    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...
  13. B

    Calcium Spots or Black Alage

    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...