Even though construction continues for our elevated spa, the pool is running. I have started using my test kit, and have been going through Pool School another couple of times.
I am trying to reconcile the different recommended CYA levels that I have seen. In Pool School it states "If you have a SWG or very high levels of direct sunlight, CYA is typically kept between 70 and 80. If you are using an ORP controller, keep CYA below 50." Well, we have an SWG, very high levels of sunlight (pool in direct sunlight all day with no shade), and an ORP controller. I didn't find any information in Pool School that explains why the CYA needs to be below 50 for an ORP controller.
The manual for our ORP controller (Hayward Sense & Dispense) says to use the recommended levels in the Pro Logic manual. The Pro Logic manual specifies a recommended CYA of 60 to 80.
So, where should I be keeping my CYA?