in the special note where it shows "details of the two filters on top" opt1 and opt2.
i used opt1 because i am not using the system for drinking water and that opt has the post di
water go thru the charcoal filter. in opt2 "use for drinking water and aquarium use" the di
does not go thru the charcoal filter. i followed the instructions exactly but could still get two different results.
there are only four stages before the di
filter but there are a total of six stages when including the di
filter and the polishing filter