Never drops .5 overnight. Screen enclosure. Not plaster dust, it's yellowish/green and won't be there for weeks then shows up. It's on walls. It's minor but there every 2 - 3 weeks.
Struggling with Algae
- Thread starter Ksbguy
- Start date
All along I have been treating this as 40ppm CYA and performing SLAM at 16 CL levels. So technically my SLAM was over and above what's defined here.
Every 2 - 3 weeks it's back. I'm 100% sure I've followed SLAM properly and maintained FC levels within the range for my CYA. I'm at a loss with this.
I'm really thinking this is mustard algae from what I've read but it's very little if it is...
I think you have done the MA shock after your normal SLAM. However, another part is that pool toys, swimming suits should be throughly cleaned as well as they may be carrying the MA on them.
I have attached the full article for yours and others reference if they are having similar issues.
Mustard Algae
Today We are going to show you how you can get rid of mustard algae in your pool. By following the steps in this guide and with no expensive chemicals.
www.troublefreepool.com
Is the OP's pool being used regularly? Sometimes when water is left untouched, even with the pump running, the water may become stagnant.
Also, could you be reading your CYA test wrong and it is indeed too high?
Also, could you be reading your CYA test wrong and it is indeed too high?
Concerned about the level of shock for MA on a plaster pool that's not a year old... Should I be?I think you have done the MA shock after your normal SLAM. However, another part is that pool toys, swimming suits should be throughly cleaned as well as they may be carrying the MA on them.
I have attached the full article for yours and others reference if they are having similar issues.
Mustard Algae
Today We are going to show you how you can get rid of mustard algae in your pool. By following the steps in this guide and with no expensive chemicals.
That's all it drops, never seen it drop more than that and never seen CC over .5ppm either.
Used few times a week typically. Have compared CYA against 50ppm water from tftestkits and taken it to two different pool stores. It's 40. I haven't raised it because I don't want to deal with even higher levels of CL needed for shocking this every 2 - 3 weeks.
You are good up to SLAM level for FC ppm. And the 24 hr soak for MA.
No FC drop overnight, water crystal clear, doing a MA 24 hour soak at 24ppm for 40 CYA. So far it's been 4 hours and it hasn't moved from 24ppm. After this I will continue to maintain FC levels at 6 - 7 for 40 CYA. I'm also brushing 3 - 4 times a day and there's nothing now. Somebody say a prayer 
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We are all with you!!!!. You got this! Your ongoing target level is great. Probably best to run on the high side for a week or so - just to be sure. Good LuckNo FC drop overnight, water crystal clear, doing a MA 24 hour soak at 24ppm for 40 CYA. So far it's been 4 hours and it hasn't moved from 24ppm. After this I will continue to maintain FC levels at 6 - 7 for 40 CYA. I'm also brushing 3 - 4 times a day and there's nothing now. Somebody say a prayer
- Jun 1, 2018
- 13,770
- Pool Size
- 26000
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite (T-15)
May want to Maintain MA minimum for a while to be sure you’re covered - most of us on #teamrunhot kinda do this anyway
www.troublefreepool.com
Chlorine/CYA Chart
EDIT: You will find a simplified and standardized version of this chart at Pool School, Chlorine / CYA Chart. Chlorine/CYA Chart by Chemgeek FC = Free Chlorine in parts-per-million (ppm) CYA = Cyanuric Acid in parts-per-million (ppm) CYA ........... Min FC3 ..... Target FC ...... Yel/Mstrd...
www.troublefreepool.com
Looks like 6.1 for 40 so 6.5 is probably minimum. I'm not even sure I have MA but out of ideas...May want to Maintain MA minimum for a while to be sure you’re covered - most of us on #teamrunhot kinda do this anyway
Chlorine/CYA Chart
EDIT: You will find a simplified and standardized version of this chart at Pool School, Chlorine / CYA Chart. Chlorine/CYA Chart by Chemgeek FC = Free Chlorine in parts-per-million (ppm) CYA = Cyanuric Acid in parts-per-million (ppm) CYA ........... Min FC3 ..... Target FC ...... Yel/Mstrd...
Does the overnight drop apply for MA shock? I had no overnight drop with end of SLAM but my FC was 26 last night and 23 this morning in the MA 24 hours soak. Afraid to run these higher levels for longer than 24 hours on plater that is still curing...
I would follow the chemgeek chart - so you hit MA shock of 60% of CYA and I would target 15% of CYA to hold for several days to ensure you stop any further growth.
- Jun 1, 2018
- 13,770
- Pool Size
- 26000
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite (T-15)
I would disregard the overnight loss & just replenish ma shock level for the remainder of your 24hrs. Don’t forget to soak all your stuff as mentioned in the article.
At higher fc levels you get a higher fc drop rate & there’s more variance with so many drops involved so the oclt isn’t always a dependable marker at ma shock levels.