I've been reading Pool Forum and now TFP for a couple years now, my inground pool is in it's third year. I had a run in with black algae last year, but thought I had knocked it out... This year, I've got a green looking stain down between the pebbles in my pebbletec finish. I've shocked, polyquat60'd, brushed, and I can get rid of this. My water is clear, I've cleaned my cartridges out twice in the past 5 weeks. I finally got an FAS DPD test kit from this site, it arrived today... here are my numbers...
cya 80ppm
fc 11ppm
cc 0.5ppm
pH 7.0
TA 70ppm
residual chlorine from previous shock attempts... and I ignorantly added cya a few weeks ago hoping that "balancing" my water would help out...
so... I'm debating what level to shock to this time... my pump and filter have been running 24/7 for about 2 weeks now... salt is at 2700...
if I go for mustard/yellow algae level (45ppm FC with my CYA levels) I'm concerned how long it will take before we can safely use the pool. But the descriptions I've seen of mustard say it clouds out when brushed, this stuff doesn't budge, and it's not floating in the water.... I'm OK with dumping the 10 or 12 gallons of bleach in the pool if this is what it takes, but I'm not certain I've got it properly ID'd, and I'd hate to take the pool out of action for a week or so on a guess...
Any ideas, this stuff seems to be in shallow areas (tanning ledge, steps, swim out) and also in full sun...????????
My son has an underwater camera, I could post pics if that would help...
Mac
cya 80ppm
fc 11ppm
cc 0.5ppm
pH 7.0
TA 70ppm
residual chlorine from previous shock attempts... and I ignorantly added cya a few weeks ago hoping that "balancing" my water would help out...
so... I'm debating what level to shock to this time... my pump and filter have been running 24/7 for about 2 weeks now... salt is at 2700...
if I go for mustard/yellow algae level (45ppm FC with my CYA levels) I'm concerned how long it will take before we can safely use the pool. But the descriptions I've seen of mustard say it clouds out when brushed, this stuff doesn't budge, and it's not floating in the water.... I'm OK with dumping the 10 or 12 gallons of bleach in the pool if this is what it takes, but I'm not certain I've got it properly ID'd, and I'd hate to take the pool out of action for a week or so on a guess...
Any ideas, this stuff seems to be in shallow areas (tanning ledge, steps, swim out) and also in full sun...????????
My son has an underwater camera, I could post pics if that would help...
Mac