Tested hot tub water yesterday morning 8:45.
FC - 1.4
CC - .6
pH - 7.2
TA - 40
CH - 70
CYA - 70
Added bleach to increase FC, baking soda to increase TA, calcium chloride to increase CH (not at the same time, TA and CH about 4 hrs apart).
Tested again at 2:30.
FC - 3.0
CC - .4
pH - 7.9
TA - 80
CH - 140
CYA - 70
Then decided to shock the water and added 12 oz bleach to bring FC to 20 per "The Pool Calculator".
Here's my question... When I tested the water last night to see what the FC level was, I had some trouble getting an accurate reading. I normally add only 1 dipper of DPD to do FC test. When I added the 1 dipper of DPD, the water (25ml) in the tube turned pink but after swirling for about 10 secs, water turned clear. So I added a 2nd dipper of DPD and water turned and stayed pink. Was a little concerned about this but kept testing. Began adding R0871. Expected FC to be below 20. Added 100 drops of R0871 but water in tube never got clear - slight pink tinge remained from 80 drops R0871 and color didn't change after adding 20 more drops (so I stopped). How accurate is FC test in kit when FC level is fairly high? How high can I accurately test FC level with this kit? I'm not sure what the FC level was and I wanted to make sure the FC level stayed high so I probably did a stupid thing by adding another 8 oz bleach.
Tested water again this morning and I couldn't get an accurate FC reading. Again had to add 2 dippers of DPD to 25ml water to get test sample to stay pink and added over 100 drops of R0871 and water never got clear. Since water sample never got clear, couldn't do CC test.
FC - 1.4
CC - .6
pH - 7.2
TA - 40
CH - 70
CYA - 70
Added bleach to increase FC, baking soda to increase TA, calcium chloride to increase CH (not at the same time, TA and CH about 4 hrs apart).
Tested again at 2:30.
FC - 3.0
CC - .4
pH - 7.9
TA - 80
CH - 140
CYA - 70
Then decided to shock the water and added 12 oz bleach to bring FC to 20 per "The Pool Calculator".
Here's my question... When I tested the water last night to see what the FC level was, I had some trouble getting an accurate reading. I normally add only 1 dipper of DPD to do FC test. When I added the 1 dipper of DPD, the water (25ml) in the tube turned pink but after swirling for about 10 secs, water turned clear. So I added a 2nd dipper of DPD and water turned and stayed pink. Was a little concerned about this but kept testing. Began adding R0871. Expected FC to be below 20. Added 100 drops of R0871 but water in tube never got clear - slight pink tinge remained from 80 drops R0871 and color didn't change after adding 20 more drops (so I stopped). How accurate is FC test in kit when FC level is fairly high? How high can I accurately test FC level with this kit? I'm not sure what the FC level was and I wanted to make sure the FC level stayed high so I probably did a stupid thing by adding another 8 oz bleach.
Tested water again this morning and I couldn't get an accurate FC reading. Again had to add 2 dippers of DPD to 25ml water to get test sample to stay pink and added over 100 drops of R0871 and water never got clear. Since water sample never got clear, couldn't do CC test.