My setup evaps near 5 gal per day. I bought a Kalk reactor from Hobogato and set it up to accomplish 2 tasks at once. I have low pressure RODI water coming into the reactor that then drips constantly and directly into the sump. A fine adjustment valve allows me to set the drip rate to keep a steady water level, and maintains the ALK level, also.

I have an opinion that mechanical and electrical devices can fail. The more of these you add into your systems, the higher the chance of failure.

Try to keep it simple.

HTH