So I've been pondering the difference between the recommended FC level for SWG/non-SWG pools at a given CYA. I'm curious if anyone has an explanation for why the FC requirement of a SWG would be less? I could see two possible theories:
1) Does the NaCl in some way make the FC more effective? Seems unlikely -- but I'm happy to hear other opinions (or better yet facts =] ).
2) Perhaps SWG result in a more consistent FC level, and thus a lower level is needed.
Here's why I've been thinking about this: I just purchased a stenner pump that I'm going to be using to constantly inject liquid chlorine into my pool. In terms of dosing schedule it seems more closely aligned with a SWG. Do I follow the SWG guide for FC or the non-SWG guide? More importantly -- why? Thoughts?