My CL levels have been low (Almost undetectable) since opening 2 weeks ago. Initially I was told my CYA was low (15) so I've added some C. Acid. then I was told my phosphates were high and was killing my CL. I added the appropriate P. Killer and now my Phosphate level is appropriate. I mentioned to the pool store that I had a nature 2 cartridge and now they say with that my CL level should be really low. Is this true? Does anyone know what level of CL is appropriate with a Nature 2 mineral cartridge?BTW I use a CL "stick" that I put the CL "hockey pucks in" and I have that on max. for added CL to the pool. I have also shocked the pool a number of times because of some alge