here my actual number
after 3 years of following tfp advice and being trouble free my pool turn to a green pool of death recently ( refering to the blue screen of death we all know)
last week i uncover the pool after 1 week and it was emerald green. my reading was then FC 4.5 with no CC, unfortunatly i didn't take the ph reading at that time so i dont know. i panic seeing the green swamp and shock it immediatly after the FC reading.
my problem is that my PH read 8 constantly no matter how much acid i put in. ( i did stop at 4 liter in a week of muriatic acid at 31%)
for the last week i shock the pool at FC 15-16 with no result, still a green swamp. then this morning i try to nuke it, and raise it to 32 and put the SWG to full speed to kept the FC high. there is little improvement but im not convincing result. there is a brownish dust in the bottom i vacuum every 2 day. i brush the pool everyday.
my gunite pool is a 85000 liter (liter because im french canadian). i wonder how, with my chlorine at 4.5, it has still turn green. ( with my swg the FC is pretty stable all the time) i suspect my PH to have rised to much and put chlorine in no effect mode.
my question are with high chlorine , how inprecise is the PH reading, badly or lightly? why with my pool water almost turn to bleach there is still algae? how inefective is chlorine at high PH, can that be the cause of having so much pain to kill algea?
i have run the pump all time since one week with SWG maintaining shock level all week.
thank in advance for your precious advice