It may require 30 mins 2x or 3x per day. A spa is usually less then 1000 gals so it mixes quickly. Times may vary if it is winter or summer (algae can grow quicker in warm water). Once you have it up and running and you are doing your own testing, you will be able to fine tune your requirement to mix the spa.This is genuine curiosity but how long would be enough for the spa to stay properly filtered? That just seems like you would have stagnant water the majority of the time in the spa. Could you not pull water from both the pool and spa equally and return it to both with one system?
Since we are discussing a disconnected spa from the pool, it would be very difficult to set the suction and return to be equal to both bodies. You risk draining one and overflowing the other if you get it wrong. Plus you would over chlorinate your Spa. IMHO it is too risky. So just set up the automation system to switch to Spa Mode several times a day for 30 mins each time. Do your testing and then adjust your timing for switching to Spa Mode. Maybe this example will help explain why you have to monitor each body of water independently
For example - using a SWCG with a 1.25 lb of Chlorine output over 24 hrs and achieve 3ppm of FC (this is the amount of chlorine that must be replaced per day to account for loss by UV, bather load, etc.)
for a 14000 gal pool you would set the SWCG at 50% and run the pump for 13.5 hrs.
For a 1000 gal spa you would set the SWCG at 50% and run the pump for 1 hr.
So this example indicates that you only need to run your SPA mode for 1 hr a day to get the proper chlorination. Remember, this is an example and we would need specific data for your 2 bodies of water to guide how to set up your Pool Mode and Spa Mode. Additionally this will change if your replace FC is higher or lower. I used 3ppm as the estimated replacement FC needed.
It may be required to run in Spa Mode longer to provide filteration of the water as the discussion above focused on the chlorination which is more critical. Using a net to manually clear the spa of leaves, debris may be best.
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