Test results and questions

[Jeffski]

FC .5
CC .5
TC 1
pH 7.5
T/A 120
CH 140
CYA 0
Temp 74

Test results from yesterday. Vinyl inground pool - 18 x 36 with 9' deep end (22,000 gallons?).

I added about 2 lbs of stabilizer yesterday and turned up the swg to raise the chlorine level.

Shooting for 2-3 on the FC reading right?

CC should be zero right? How do I drop that?

Pool has been open for about 3 weeks but I've spent very little time on it due to work. The water is actually clearing up nicely. I have another problem though with possibly mustard algae or something that collects on the seams and bottom of pool. When you brush it it disappears but then settles back down a couple hours later. My wife says it's dirt but I'm sure it's not because it will show up right after running the Aquabot and when you brush it it disappears into a cloud. You can't brush it around like you can with dirt. Anyone know what that is and how to get rid of it? It was a problem all of last year also.

Thanks in advance.

[CarlD]

If you have an FC level of .5 but a CC level also of .5, you need to shock your pool. At the moment (until your CYA level stabilizes) you need to bring that chlorine level up to 10ppm and keep it there for a couple of days. Then the SWG can do it's job.

[Watermom]

It could be dust or dirt that is settling in the seams and bottom of your pool. My pool does that. When I vacuum or when we swim it gets stirred up and you can't see it. But, then when the water settles down, it will often resettle again.

[aylad]

It could be dust or dirt that is settling in the seams and bottom of your pool. My pool does that.

Mine does, too.

Janet

[Jeffski]

I'm sure it's not that though because I can vacuum or run the Aquabot and the bottom of the pool will be covered hours later.

[aylad]

Dirt or pollen is like anything else that's not soluble in water.....if you stir it up, as with the vacuum or Aquabot, then let the water get still, what didn't go into the filter will settle back down in the bottom.

However, if you're sure it's not dirt, you could try swimming down to a particularly dense area of whatever it is, and use an eyedropper to get a sample. By putting it into a jar or glass of water, it might be easier to identify.

Are you using chlorine overnight? By that I mean have you tested your Cl at night after the sun is off the pool, and then tested again in the morning before the sun hits it? That would give you a true idea of how much chlorine demand you actually have....and if it's none, then the stuff is dirt. If it's algae, you'll see a dramatic drop in the Cl level from night to morning.

Janet