I’ve never used the auto flush, seems cool but also kit needed if you aren’t making tons of water constantly for long periods imo.
I disagree with @richiev s logic.
I use membranes in series to reduce waste. Yes it works. I have 3 membranes and get 1:1 waste to product.
Membranes 2 and 3...
I have no clue, but I do see other systems performing differently. I thought everybody in the city was on the same water provider. I’d have to look up company name.