Vinyl Liner Has Dark Stains On Bottom
by Greg
The bottom has developed dark stains that seem to be coming from under the liner. They do not scrub off or respond to shock treatments or algae treatments. (Black and normal) I have heard that black algae can exist under the liner and stain through it. Is this true, and if so, how do you treat it? If I have to replace the liner, can I treat the sand underneath the liner to prevent this from re-occurring? Thanks for the question Greg Before we jump to conclusions, we need to see what the stains are. You can crush some Vitamin C tablets in a sock and put them on the stain for about an hour. If the stain lightens up or is gone, it's a metal stain. Go here to learn how to remove metal stains: Pool Liner Stained From Acidity Too High Next, you can put a Trichlor puck on the stain. If that lightens it up or removes the stain, it's organic. This can be treated with a good pool shock and an adequate chlorine level. Black algae in a vinyl pool is possible, but not very likely. Black Algae The stain could possibly be a fungus and growing under the vinyl liner. To treat a fungus would mean getting a fungicide and putting that under the liner. This means draining the pool to apply the fungicide and installing a new liner. There is a foam that you can possibly use, but you'll want to check with the manufacturer of your pool to see if it's possible. Here's a post I answered about that: Inground Pool Steel Walls..Should You Use Foam On The Walls? This was for an inground pool. Hope this helps and good luck with your pool. Robert New Question: Wrinkles And Black Areas On An Inground Vinyl Liner Pool By: Alta From: Cleveland, Ohio Date: June 22, 2011 We have an 18 x 36 inground vinyl liner pool. A DE filter liner is 3 years old this year. We have wrinkles in the shallow end and black spots deep and shallow ends which seems to be under liner. Any solutions? Answer By: Robert Date: June 22, 2011 Thanks for the question Alta I have actually answered very similar questions in the following posts: Black Stains On My Above Ground Saltwater Pool Vinyl Liner Has Dark Stains On Bottom Black Algae Black algae normally doesn't occur on vinyl pools, it can, but unlikely. Brown Algae Won't Come Off Of A Vinyl Liner You first need to see whether the black spots are either organic or metal. If it's organic you'll need to do an ascorbic acid treatment. The link above gives details on how to do that treatment and how to see if the black spots are metal. Here are some other posts about wrinkles in a liner: How Do I Get Out Wrinkles In Aboveground 24' Expandable Liner Swimming Pool Liner Wrinkles and Black Algae Problems These are the links you need for troubleshooting your problem. Due to space and similarity, I'm merging your questions with this one: Vinyl Liner Has Dark Stains On Bottom If you have any more questions or comments, you can find this link on the Q&A page in the "Pool Liner" category. Swimming Pool Questions and Answers Hope this helps and good luck with your pool. Robert |
