borjis
LifeTime Supporter
Lower the CYA first, or else you will be buying WAY more bleach.
I would get it down to at least 70. 50 being better, 30 being best if possible
priot to the slam.
The CYA test to be accurate, is best performed in full sun or
at least bright over cast lighting conditions (a Taylor rep said overcast is ok recently)
with your back to the sun, holding the vial at waist level, pour
in solution slowly until it just starts to hide, then look away then look
at the dot, then away then the dot, then pour in more if necessary
til you get a number.
If that reads over 100, you can substitute half the pool water with tap
water, then multiply the result by 2. It won't be quite as accurate, but
will be a better approximation of the true cya value.
I did this once on my first pool after buying a house and it was 300+
I would get it down to at least 70. 50 being better, 30 being best if possible
priot to the slam.
The CYA test to be accurate, is best performed in full sun or
at least bright over cast lighting conditions (a Taylor rep said overcast is ok recently)
with your back to the sun, holding the vial at waist level, pour
in solution slowly until it just starts to hide, then look away then look
at the dot, then away then the dot, then pour in more if necessary
til you get a number.
If that reads over 100, you can substitute half the pool water with tap
water, then multiply the result by 2. It won't be quite as accurate, but
will be a better approximation of the true cya value.
I did this once on my first pool after buying a house and it was 300+