Thinking of converting to salt and am trying to figure which size to get. I want Hayward because all other equipment is Hayward. My pool is roughly 10k gallons, not sure to get the 25k or the 40k gallon kit
So it should be very clear from the above table that to get significant savings one really has to use the larger cell sizes of the IC60 (or at least the IC40) for Pentair Intellichlor and the T-CELL-15 (not LL) for the Hayward AquaRite. This assumes that the cells actually last as long as indicated based on usage and that they do not degrade at all based on time alone. [EDIT] Note that the larger cells will output higher FC out of the returns (see this post) so for lower pump flow rates and/or smaller pools that could be too high an FC. [END-EDIT]
Yes. The total cost of ownership is lower when you go big. See here -
Economics of Saltwater Chlorine Generators
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Do you have automation?
I would suggest getting the AquaPlus with the T-15 cell. You can control the pump, salt and other things.
Studies show running a pool pump for 3-4 hrs is about all that is needed. For us with a SWG we run longer depending on FC demand and SWG size. Most pools loose around 2ppm of FC a day. A T-15 cell @ 100% makes 1.4lbs of FC a day so it takes 2.9hrs to make 2ppm of FC. A T-9 cell @ 100% makes .7lbs a day so it would take 5.8hrs to make 2ppm of FC for your pool. So get the T-15. If you need to run your pump longer you can decrease the cell generation percentage.
I simply have my solar controller connected to the VS pump (both are Pentair) then a simple intermatic timer turns power to my SWG (Hayward) on and off. The pump's onboard timer/controller controls pump speeds and programs. The SWG timer is set to power the SWG during a time that I know the pump will be running. Any time heat is called for and available at the solar panels, the controller opens the valve and ramps up the pump speed. It all works fine with no automation system.
To work together the pump and solar controller need to communicate. That generally means the same brand. I don't know what's available in Hayward, but my Pentair SolarTouch control cost about $125, was a breeze to install and does everything I need. Allows me to run my SWG at 1400 rpm and when solar comes on it ramps speed to 2400. You can setup any speeds you need and only use enough to effectively handle each task. I have speeds set for AM cleaning, SWG chlorination, extra slow filtration and the solar controller is set for a seperate speed selected to support the heating.
The ProLogic should be able to do everything you need, including solar. Check with Hayward about specifics.