- May 12, 2011
- 10
Does the "basic 5" drops test kit test for CYA? Is the "Acid demand" test for CYA or Ph adjustment?
You can use the chemical fact that for every 10 ppm Free Chlorine (FC) added by Trichlor, it also increases Cyanuric Acid (CYA) by 6.1 ppm. A typical pool uses between 1.5 and 2.5 ppm FC per day, so figure an average of 2 ppm FC assuming the pool is in direct sunlight. If using only Trichlor pucks/tabs for chlorination, that would mean 7*2*0.61 = 8.5 ppm CYA per week, so a pretty slow increase. Also, without any CYA in the water initially, the chlorine will get broken down by the UV in sunlight too quickly so the Trichlor pucks/tabs may not be able to keep up.PoolSchool said:So, theoretically speaking, anyone want to venture an informed guess how long you would use pucks before CYA got to 40-50? I'm not being stubborn on the pucks, it's more not to waste that huge bucket. I thought I could use them for whatever period of time, kill the CYA/high Ph bird with one stone for now, then switch when CYA gets to the right place.