Forgot to ask this in my other post:
How often should one test and is there such a time when you "learn" your pool's chemistry needs and are able to reliable add xx oz. of Cl, etc. on a daily or semi daily basis?
If the pool is clear and pH is on target is it ok to allow Cl to fall to 1 before bringing it back up to 3-4?
Or does the Cl need to be consistently kept at 3 or more?