Can too much algeacide affect the probe reading?
I screwed up this year, I ran out of shock and I was late in adding CYA to my prfectly balanced pool thinking i will run the SWG 12 hrs/day to compensate. well that didnt work as the Fc was always around .8 to 1 ppm and the walls started to green up even though the water was crystal clear.
got a delivery of shock and cya. Dissolved the cya over a few days and settled in @ 40 ppm while the ph dropped to 7.1. shocked the pool to well over 12 ppm.. i stopped counting drops as not to waste the reagent. Brushed the walls. the ph shot up but selled down after a few days. 3 days later my FC was around 8 ppm but walls still had green stains in a few areas. went to the local walmart and picked up the HTH 30% algeaguard that they carry to give that a try. was heavy handed and put in twice tha recommended amount thinking more is better / faster. Water was a little hazy for 2 days but now perfectly clear. Green stains disappeared and water looks amazing
Current chemical balance via taylor K-2006
fc = 3.8 ppm
cc =.2 ppm
salt =3300 ppm
so far evrything is great.
a few days later i check the screenlogic app and see the ph @ 7.2, the next day, 6.8.
I test the water and ph is 7.6.
after some rain the probe is reading 5.9, again i test the water in the pool and at the probe flow bowl and its 7.6.
Right now the probe reads 4.6. I removed probe to clean it with brush and detergent and no change in reading. going to acid clean later and see.
the only variable is the algeacide. what else could explain a slow steady decline in probe readings?
it seems too much of a coincidence that the probe failed or the cable went bad so thats why i'm suspecting the algeacide.