Very green lagoon style pool - helping friend learn TFPC and getting control of pool

Steve it makes me wonder if someone found and stirred up a patch or two of algae that had not been killed before.

Now comes the hardest part.....................the time to jewel like clearing! It is said the last 10% takes 90% of the time.

Kim
 
There isn't a single large light. I thought there were no lights except the rope light around the edge but my friend pointed out 3 small, maybe 3" diameter, lights. They don't look like a wet niche style but they might be. Think they should come out? I can post a picture tomorrow if needed.
 
If they are wet niche lights, I would take em out. But thats just me.
I did the same thing as you last spring in slamming a friends pool. Water was clear, no CC's but never could pass the OCLT. I slammed for 3 more days with perfectly beautiful water but still failed that last part. Finally, I grew some and got in the cold water to take out the light. Light niche chock full of algae. Got that out and passed OCLT that night. So, my recommendation is just from my personal experience. There might not be any in there, but you just never know till you take them out.

There isn't a single large light. I thought there were no lights except the rope light around the edge but my friend pointed out 3 small, maybe 3" diameter, lights. They don't look like a wet niche style but they might be. Think they should come out? I can post a picture tomorrow if needed.
 
A good scrubbing with at toothbrush might be the thing for those lights. Also do all around the skimmer face and look at the skimmer door as well as there was one that had a small crack in it so algae started growing there.

Kim
 
Here's a pic of the pool. Day 9. Chlorine consumption overnight was very low and CC still 0. Water is clearing everyday. Keep in mind the "normal" color of the pool, due to the plaster color, is a teal/aqua color...

Here's a pic of the lights too. Think we should figure out how to get them out? I bet they have not been out since the pool was installed so a bit concerned about trying to get them out.

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What I would do is put on a mask and go down and look at them. Do they have a screw you can take out? Do they look like the are just stuck TO the wall or are they IN the wall? Do they have a name on them? The answers to these questions will help us plan your next move.

Kim
 
They look like they are in the wall, firmly attached. No visible screws. they are only a few inches below the surface of the water, so I got a good look already. I'm nervous to pull them, as I think they've been there a while...

Question though, if there's a gap where algae can get in, I assume the chlorinated water can too - wouldn't that kill it off if there was any? I always wondered about that advice, to pull lights and stuff, looking for algae.
 
Chlorinated water can't get into places where there is no motion. One of the reasons that you should always brush your pool surface. At the actual surface of the pool there is very little, to no, motion of the water. Once the water that is there uses up it's chlorine, there is little reason for it to get replenished. If it does, it happens very slowly, which gives the yuck time to grow.

There are other organic things that can thrive in a pool in darkness, with warmth from the light. Not everything we kill is algae.
 
At home I have a thread where the guy made a graph of his SLAM. It is VERY interesting. On the graph he marks where he took out his light. It is VERY telling in that he finished his SLAM where he had stalled before that. I will share that with you when I get home.

Talk to the pool owners. I would also wait until the water is jewel like THEN we will talk more about it.........You never know that you might be able to not have to do the light but...........my gut says you will so.......

Kim
 
They look like they are in the wall, firmly attached. No visible screws. they are only a few inches below the surface of the water, so I got a good look already. I'm nervous to pull them, as I think they've been there a while...

Question though, if there's a gap where algae can get in, I assume the chlorinated water can too - wouldn't that kill it off if there was any? I always wondered about that advice, to pull lights and stuff, looking for algae.

Unfortunately, the chlorine in the water will not usually take care of it. Lights/returns/ladders/steps/skimmers/drains etc. can be a real issue sometimes, preventing you from being able to stop your chlorine levels from dropping so much, and not allowing you to pass OCLT.

I'm helping another couple right now who have a screw stuck in their light that they can't get out, and visible algae behind it. We had pretty good luck the other day having them take the garden hose with a sprayer on it, and had them spray around the fixture, using some water force. They were able to get a bunch of algae and yuck out that way. (Definitely not the preferred method, but certainly better than nothing). So, if you don't feel comfortable removing them that too may be an option for you to try. Also, if you can see any opening around them, you can also take a turkey baster, and try to squirt diluted bleach water in behind it. If that doesn't help, and you still can't get the levels to stop dropping so you can pass OCLT then you might want to reconsider removing them because odds are algae is lurking behind them causing you the trouble.

I hope this helps, and have a nice day. :)
 
Also, algae that is stuck to a surface can form a film over itself that chlorine can't penetrate very easily. By brushing and removing the algae from the surface, you destroy or at least put a 'kink in that armor' and then the chlorine can get in and do its job.
 

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