- May 27, 2019
- 1,621
- Pool Size
- 25000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite Pro (T-15)
Hi. My name is James. And I have Mustard Algae
First...Yes, I am fighting CYA buildup. I drained the pool this year. Completely! And I added enough stabilizer for 30 ppm. I did not understand how much stabilizer is in the Tri-Chlor 3" tablets and used them for about 6 weeks. I have now have an 80 PPM CYA level (as measured with a Taylor 2005 wet kit). I'm trying to keep the Free Chlorine level around 8 ppm. I use a Taylor chlorine titration kit for chlorine level.The issue is sunlight.
I am using Cal-Hyp tablets now. They are 8 oz each and take 4 days to dissolve. This means I'm adding 4 oz of cal hypo per day. This adds to chlorine level by 0.75ppm/day. I'm using cal-hyp 53% powder as a supplement as needed.
My pool has no shade. Sun starts to hit the pool about 8AM and does not go away until 6PM. Yesterday, I lost 2 PPM, net (8 yesterday morning, down to 6 PPM today). So sunlight is taking about 2-3 PPM/day. But on a cloudy day, the Chlorine level increases by about 1 PPM (as I would expect with the Cal-Hypo tablets).
If my Level gets to 6PPM or less, the Mustard starts to grow. I'm mostly controlling by trying to keep the level to 8PPM and brushing twice a week. But even then, I might see a little mustard forming in certain areas that do not get a lot of water flow.
I certainly can do a partial drain to get back down to 30-50 PPM. Not sure how this will help with the chlorine usage from the sunlight. I saw notes that higher levels of sunlight (like Houston) need higher stabilizer levels. But I can't find any charts on this.
The rest of the levels: I keep the Ph Between 7.4-7.6 (muriatic acid), TA = 110, CH = 200-210 (low on purpose as I'm using Cal Hypo), CYA 80, Borate 50, CSI -0.02, Temp 86 F.
First...Yes, I am fighting CYA buildup. I drained the pool this year. Completely! And I added enough stabilizer for 30 ppm. I did not understand how much stabilizer is in the Tri-Chlor 3" tablets and used them for about 6 weeks. I have now have an 80 PPM CYA level (as measured with a Taylor 2005 wet kit). I'm trying to keep the Free Chlorine level around 8 ppm. I use a Taylor chlorine titration kit for chlorine level.The issue is sunlight.
I am using Cal-Hyp tablets now. They are 8 oz each and take 4 days to dissolve. This means I'm adding 4 oz of cal hypo per day. This adds to chlorine level by 0.75ppm/day. I'm using cal-hyp 53% powder as a supplement as needed.
My pool has no shade. Sun starts to hit the pool about 8AM and does not go away until 6PM. Yesterday, I lost 2 PPM, net (8 yesterday morning, down to 6 PPM today). So sunlight is taking about 2-3 PPM/day. But on a cloudy day, the Chlorine level increases by about 1 PPM (as I would expect with the Cal-Hypo tablets).
If my Level gets to 6PPM or less, the Mustard starts to grow. I'm mostly controlling by trying to keep the level to 8PPM and brushing twice a week. But even then, I might see a little mustard forming in certain areas that do not get a lot of water flow.
I certainly can do a partial drain to get back down to 30-50 PPM. Not sure how this will help with the chlorine usage from the sunlight. I saw notes that higher levels of sunlight (like Houston) need higher stabilizer levels. But I can't find any charts on this.
The rest of the levels: I keep the Ph Between 7.4-7.6 (muriatic acid), TA = 110, CH = 200-210 (low on purpose as I'm using Cal Hypo), CYA 80, Borate 50, CSI -0.02, Temp 86 F.