I switched from bromine to chlorine, using the dichlor then bleach method, three months ago. Everything went normally on the switch over during both setup and use for three months. Because of a gradual buildup of combined chlorine, I decided to go ahead and do a drain and refill now.
So yesterday I drained and cleaned and refilled. I did not use Ah-some this time since I did an Ah-some purge three months ago, and the tub was new six months before that. I then balanced the water chemistry as follows:
Tub is 330 gallons when full. Fill water is well water. pH ~6.5, TA 20, CH 25. Fill temp is 66 deg F.
Added 9.0 oz of 99.9+% pure boric acid from Florida Laboratories to bring borates up to calculated 50ppm.
Added 4.4 oz of calcium chloride to bring CH up to calculated 150ppm.
Added 3.25 oz of baking soda to bring TA up to calculated 80ppm.
Checked pH with test kit. Reading at 7.4.
Added 2.45 oz dichlor to bring CYA up to calculated 40ppm. This also brought chlorine up to calculated 44ppm.
Added 1.5 oz of 35% hydrogen peroxide to neutralize most of the chlorine. Calculation called for 1.75 oz but the 1.5 oz actually neutralized the chlorine down to zero.
Added 1.5 oz of bleach to bring the Chlorine up to calculated 4ppm.
Checked FC 3.5 ppm, CC 0.
At this point, water is beautifully crystal clear and I put the lid on and set the heater to bring it up to about 90 deg F overnight. Chemistry should be, by calculation:
FC 3.5 (tested)
CC 0
pH 7.4 (tested)
TA 80
CH 150
CYA 40
Borates 50
This afternoon, I lifted the lid breifly to take a water sample to test the chemistry and adjust parameters if necessary. Following results:
FC 3.0
CC 0
pH 7.2
TA 70
CH 150
CYA 30 (not sunny today so not sure)
I decided to add a little more baking soda to bump the TA and pH up, so I took the lid off, and was greeted with very yellow water. I'd say the color is more yellow brown than green anyway. My wife described the color as brownish green. The wall next to the tub is dark blue so the light reflecting from it might affect the color some. The sides and bottom of the tub, which are light tan vinyl appear to be stained, and the underside of the lid was clearly stained where it contacted the water. When I wiped the underside of the lid with a white terrycloth rag, some but not all of the stain wiped off leaving stains on the cloth. The color of the stains look yellow brown to me and brownish green to my wife. The filter cartridges which were put in clean yesterday were extremely dirty, mottled with dark brown substance which appears to be water soluble and/or easily sprayed off. I think the cartridges will clean up completely, although I haven't done so yet.
The only things that differ from previous fills is that the boric acid is from Florida Laboratories instead of from Duda Diesel, and that I added more dichlor to get the CYA up right away, and then used hydrogen peroxide to neutralize the chlorine. I did a similar process about six weeks ago, at Matt's sugestion, when I was trying to neutralize combined chlorine, and at that time there was no discernable side effect.
I can't believe that this was an algae bloom in fresh water that had been super chlorinated, and then left covered to heat at 66 deg F with 3.5 FC. I'm guessing that it is due to some type of chemical reaction, but I can't imagine what.
I've attached some pictures. The tub, the filters next to a clean filter, and the inside of the lid. You can just barely see the stain on the inside of the lid.
Just before writing this post, I added chlorine up to about 20ppm to see what would happen.
Any thoughts would be appreciated.
thanks,
Michael
So yesterday I drained and cleaned and refilled. I did not use Ah-some this time since I did an Ah-some purge three months ago, and the tub was new six months before that. I then balanced the water chemistry as follows:
Tub is 330 gallons when full. Fill water is well water. pH ~6.5, TA 20, CH 25. Fill temp is 66 deg F.
Added 9.0 oz of 99.9+% pure boric acid from Florida Laboratories to bring borates up to calculated 50ppm.
Added 4.4 oz of calcium chloride to bring CH up to calculated 150ppm.
Added 3.25 oz of baking soda to bring TA up to calculated 80ppm.
Checked pH with test kit. Reading at 7.4.
Added 2.45 oz dichlor to bring CYA up to calculated 40ppm. This also brought chlorine up to calculated 44ppm.
Added 1.5 oz of 35% hydrogen peroxide to neutralize most of the chlorine. Calculation called for 1.75 oz but the 1.5 oz actually neutralized the chlorine down to zero.
Added 1.5 oz of bleach to bring the Chlorine up to calculated 4ppm.
Checked FC 3.5 ppm, CC 0.
At this point, water is beautifully crystal clear and I put the lid on and set the heater to bring it up to about 90 deg F overnight. Chemistry should be, by calculation:
FC 3.5 (tested)
CC 0
pH 7.4 (tested)
TA 80
CH 150
CYA 40
Borates 50
This afternoon, I lifted the lid breifly to take a water sample to test the chemistry and adjust parameters if necessary. Following results:
FC 3.0
CC 0
pH 7.2
TA 70
CH 150
CYA 30 (not sunny today so not sure)
I decided to add a little more baking soda to bump the TA and pH up, so I took the lid off, and was greeted with very yellow water. I'd say the color is more yellow brown than green anyway. My wife described the color as brownish green. The wall next to the tub is dark blue so the light reflecting from it might affect the color some. The sides and bottom of the tub, which are light tan vinyl appear to be stained, and the underside of the lid was clearly stained where it contacted the water. When I wiped the underside of the lid with a white terrycloth rag, some but not all of the stain wiped off leaving stains on the cloth. The color of the stains look yellow brown to me and brownish green to my wife. The filter cartridges which were put in clean yesterday were extremely dirty, mottled with dark brown substance which appears to be water soluble and/or easily sprayed off. I think the cartridges will clean up completely, although I haven't done so yet.
The only things that differ from previous fills is that the boric acid is from Florida Laboratories instead of from Duda Diesel, and that I added more dichlor to get the CYA up right away, and then used hydrogen peroxide to neutralize the chlorine. I did a similar process about six weeks ago, at Matt's sugestion, when I was trying to neutralize combined chlorine, and at that time there was no discernable side effect.
I can't believe that this was an algae bloom in fresh water that had been super chlorinated, and then left covered to heat at 66 deg F with 3.5 FC. I'm guessing that it is due to some type of chemical reaction, but I can't imagine what.
I've attached some pictures. The tub, the filters next to a clean filter, and the inside of the lid. You can just barely see the stain on the inside of the lid.
Just before writing this post, I added chlorine up to about 20ppm to see what would happen.
Any thoughts would be appreciated.
thanks,
Michael