So as I understand it, as CYA increases, it protects FC better from destruction by sunlight. As CYA increases, you need more FC for the same level of sanitizing effect. You will lose some of this FC to sunlight every day and have to add chlorine to maintain these levels. The 'goal' according to Pool Math is 30-80 ppm CYA, depending on whether you are going by the Traditional Pool or Trouble Free Pool criteria. But is there a best number? I am going with the TFP criteria so it's the 30-50 ppm range for me.
I'm sitting at 41 ppm CYA and am trying to decide whether to hold it at that level of get it to 50 ppm. According to the handy chart here on TFP, at 40 ppm CYA, you need a minimum of 3 ppm FC and more favorably 5-7 ppm. At 50 ppm CYA, you need a minimum of 4 ppm FC and more favorable 6-8 ppm. So.... is one better than the other?
Since more CYA protects the chlorine better but yet the more CYA you have, the higher the FC level you need to maintain, at what level of CYA have you reached the optimum of free chlorine protection from sunlight versus higher required free chlorine? At higher CYA levels I assume you lose less FC to sunlight each day, but at what point does this reduction in FC loss justify the increase in required FC level that must be maintained? Assuming you have the free chlorine at the proper level for a given amount of CYA in you pool, at what level of CYA are you having to add the least amount of chlorine to the pool on a per week basis to maintain the desired FC level?
I'm sitting at 41 ppm CYA and am trying to decide whether to hold it at that level of get it to 50 ppm. According to the handy chart here on TFP, at 40 ppm CYA, you need a minimum of 3 ppm FC and more favorably 5-7 ppm. At 50 ppm CYA, you need a minimum of 4 ppm FC and more favorable 6-8 ppm. So.... is one better than the other?
Since more CYA protects the chlorine better but yet the more CYA you have, the higher the FC level you need to maintain, at what level of CYA have you reached the optimum of free chlorine protection from sunlight versus higher required free chlorine? At higher CYA levels I assume you lose less FC to sunlight each day, but at what point does this reduction in FC loss justify the increase in required FC level that must be maintained? Assuming you have the free chlorine at the proper level for a given amount of CYA in you pool, at what level of CYA are you having to add the least amount of chlorine to the pool on a per week basis to maintain the desired FC level?