CYA Testing
- Thread starter kcassidy0772
- Start date
Here is latest update on my SLAM. I’m not the best at noticing subtle changes in appearance, but I’d say every few days I’ve noticed a little improvement in clarity. Color is still light green, and not 100% clear but I can completely see bottom no problem and the biggest change is I can see liner on side walls for the most part now. A week ago even though I could see bottom of pool’ side walls were just a blur below the water line. Now I can see a lot of the detail on the liner. What is noticed yesterday is that I didn’t use nearly as much chlorine. My total FC loss for the 24 period was only about 7 ppm. Does that make sense even though I still have obvious algae issues still and it was sunny all day yesterday too?
Attachments
- Jun 24, 2021
- 16,255
- Pool Size
- 29000
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-60 Plus
I have a question about CYA. I have to add about 2 inches of water because of water loss. I’m still in the middle of my SLAM so being on top of my CYA level is my concern. Would adding 2 inches of water have any real impact on my CYA level? Even though I’m not draining any water out I am adding so I guess that could dilute it some? Should I add some stabilizer in a sock at the same time to raise a bit?
The 2" add of water has virtually no affect. SLAM on!
Simple math. 2 inches added/removed to 48 inches is 1/24th or a hair over 4%. It'd be unnoticeable across the board.
Let stand for 2-3 minutes? Have I been doing it wrong? I don’t see the let stand for 2-3 minutes in the instructions?
- Jul 21, 2013
- 65,399
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
Just curious if I haven’t been waiting long enough. I do the 30 second wait and shake then add to tube.
- Jul 21, 2013
- 65,399
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
I see no reason to rush.
I mix the CYA test, set it down, do another test, and then CYA test is ready for viewing.
Mine gets remixed several times while doing best 2 out of 3. I mean 5. Crud that ones iffy. Best of 7 it is !!! 
Just keep pouring back and forth until you get a couple that agree.
Just keep pouring back and forth until you get a couple that agree.
What I’m confused by is that my SLAM started just over 2 weeks ago. And for the last week the color hasn’t noticeably changed at all. But at the same time, there’s really nothing to vacuum most days either. So the green isn’t improving, but no algae appears to be dying anymore.
it’s hard for me to tell because I’m gone for most of the day during the week. So what I do is at 5:30am I test the water and it’s right around 20ppm which is perfect for my CYA of 50. Then I put in about 96-128oz to about 28-31ppm I guess. Then My wife gets home around 12:00- 1:00pm and I have her add a full bottle. Then I get home and test about 6:30pm and it’s at around 20ppm. That’s pretty much consistent Monday-Friday readings and how much I add. So I’m not really sure how much is wasted because of overdosing.
A bunch. FC burns off as a %, which means more loss at higher levels. It's mostly unnoticeable towards normal levels but becomes really noticeable in the 20s.
Just dose to 20. If it's down to 15 or whatevs when you dose next, it's still working great and you're 11 FC over min.
Get some bearing on the loss over the weekend.
But if I let it drop below the 40% target of my CYA for a chunks of the day doesn’t that make it take a lot longer to get out of SLAM? And this doesn’t have anything to do with being stuck in this green stage does it?
No and no.
It won't be dropping to single digits. You're past the high loss stage where you extend the slam with infrequent dosing.
It won't be dropping to single digits. You're past the high loss stage where you extend the slam with infrequent dosing.
Ok I’ll give that a shot tomorrow. But is it strange that I’m stuck in the same stage for over a week? Funny because as far as clarity I can see so well to the bottom even from a distance. I can see the walls clearly. Just stuck in that light green color still. And like I said there isn’t much of anything on the pool floor to vacuum each day. But when I brush the water does get cloudy for a minute until the water settles again.
2:15pm - 18.5ppm - added 2.7ppm
4:45pm - 19.0ppm - added 2.7ppm
7:30pm - 18.0ppm - added 2.7ppm
I’m going to check again after dark just so I can get a better overnight loss. But so far during day, Looks like I’m losing about 1.75ppm per hour. What do you think this indicates in my situation?
Ok so I got home early today so I started to check my levels about every 2.5 hours and add FC to about 20ppm each time. Here are the results:
2:15pm - 18.5ppm - added 2.7ppm
4:45pm - 19.0ppm - added 2.7ppm
7:30pm - 18.0ppm - added 2.7ppm
I’m going to check again after dark just so I can get a better overnight loss. But so far during day, Looks like I’m losing about 1.75ppm per hour. What do you think this indicates in my situation?
Lots of loss. Backed up by visible proof of dead algae
We're finally over the pollen here so it's probably not environmental.
If you pass SLAM and the OCLT and it's still green, there could be a metals issue also.