Couple of things.
Your feeding your RO with water softened by a sodium swap water softener? Is this better then water direct from the tap?
Your putting two things onto the float valve. The waste water shut off and the overflow protection. If the float valve malfunctions then you have two problems.
In my system I am using a set timer to fill the storage container. I also use a float valve to back this up. My timer is set and controls a solenoid before the RO unit all together so it is overflow protection and waste water shut off. And if either one breaks I am still in the clear.
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