Hi everyone,
First time post here. I'm following all the steps for shocking with bleach. Have a 16,000 gallon inground Pebble Tech pool and have used liquid bleach solely (with an occasional trichlor tab or two and polyquat) for about 5+ yrs now. Usually keep a close eye on the readings throughout the year, so I really have never had a problem. Haven't had the need to drain or even shock since we did the Pebble Tech about 4 yrs. ago.
However -
Last week, I noticed a bit of green algae in a few spots around the pool.
My readings at that time were;
FC =2.0 (normally 3-4)
CC=0
Alk = 120
PH 7.6
CYA = 35-40
Cal= 350
temp = 68*
So I began the shock treatment the night before last.
Brushed all areas. Brought the FC level up to 14. Next morning was down to FC=5.0ppm, added more bleach, brushed etc. yesterday throughout the day and eve.
This morning reading was 9.0 w/CC=0, so I added another 3 (96.oz 6%) jugs, which (after waiting about an hour to test) only brought the level up to 12ppm. So I added another two 96.oz jugs. After waiting another 1/2 hour or so, I checked again. New reading was back down to 11ppm. (CC=0).
Huh????
I'm somewhat confused at this point. The green algae is gone at least. I've used a total of 18- 96oz.6% jugs so far.
I'm using the PS233 test kit (from pool solutions) (DPD powder etc.).
The only thing that *I* can think of that possibly could be a prob is my DPD powder is from last summer, and it looks just a little off-white/gray, rather than the bright white it used to be and I suppose could be giving me inaccurate FC readings???
Just wondering if anyone has any ideas, or has experienced this in the past.
Thanks in advance!
First time post here. I'm following all the steps for shocking with bleach. Have a 16,000 gallon inground Pebble Tech pool and have used liquid bleach solely (with an occasional trichlor tab or two and polyquat) for about 5+ yrs now. Usually keep a close eye on the readings throughout the year, so I really have never had a problem. Haven't had the need to drain or even shock since we did the Pebble Tech about 4 yrs. ago.
However -
Last week, I noticed a bit of green algae in a few spots around the pool.
My readings at that time were;
FC =2.0 (normally 3-4)
CC=0
Alk = 120
PH 7.6
CYA = 35-40
Cal= 350
temp = 68*
So I began the shock treatment the night before last.
Brushed all areas. Brought the FC level up to 14. Next morning was down to FC=5.0ppm, added more bleach, brushed etc. yesterday throughout the day and eve.
This morning reading was 9.0 w/CC=0, so I added another 3 (96.oz 6%) jugs, which (after waiting about an hour to test) only brought the level up to 12ppm. So I added another two 96.oz jugs. After waiting another 1/2 hour or so, I checked again. New reading was back down to 11ppm. (CC=0).
Huh????
I'm somewhat confused at this point. The green algae is gone at least. I've used a total of 18- 96oz.6% jugs so far.
I'm using the PS233 test kit (from pool solutions) (DPD powder etc.).
The only thing that *I* can think of that possibly could be a prob is my DPD powder is from last summer, and it looks just a little off-white/gray, rather than the bright white it used to be and I suppose could be giving me inaccurate FC readings???
Just wondering if anyone has any ideas, or has experienced this in the past.
Thanks in advance!
