matj6876 said:Question - If my CYA is 50 how far do I have to let the FC drop before swimming?
Opinions vary. I figure you are fine about an hour after any chemical additions as long as FC is 20 or lower.
matj6876 said:Question - If my CYA is 50 how far do I have to let the FC drop before swimming?
First of all, you do not need to be concerned about Giardia or Crypto in residential pools unless you have someone over swimming who is ill which is unlikely. These pathogens don't spontaneously generate and aren't in the normal environment around pools. They are introduced by sick people, period. This link gives a survey of recreational water illnesses and in public and commercial pool environments, virtually all illnesses except these protozoan oocysts were due to inadequate sanitation. The Giardia and especially Crypto were sometimes in pools that had inadequate sanitation, but outbreaks were also found in pools with adequate sanitation. Again, this is public pools where this is the main issue because there are a LOT of people who go into the pool and it only takes one ill person.EskimoPie said:Thanks Jason, I've seen also those tradeoffs... I maintain about 4ppm chlorine with only a 30% setting 8 hours a day on my IC20 SWCG so I'm thinking the ozone isn't really destroying all that much chlorine, or my ozone generator isn't working all that great.
What I'm really wondering though is how effective the ozone is on killing the nasty bugs like Crypto. Assuming all pool water makes it through the plumbing once per day, can I safely assume no Crypto will survive more than a day in my pool?