Help with DOS for water changes

Mr.BobDobalina · 2026-10-19T07:48:22-0400

I am at a loss with this thing. Bout ready to throw it in the trash. Yesterday I came on to find out why my manual WC wasn't working. Got it going and it went all day. This morning I set it up to do another and for some reason ithe 1st pump for adding new water switches to removing water after 1 cycle. Why are these so finicky?!

Mr.BobDobalina · 2026-10-19T10:38:18-0400

Mr.BobDobalina · 2026-10-19T10:38:53-0400

In case anybody can help with the screens above. TY

n2585722 · 2026-10-19T20:00:48-0400

#apexusers is there someone that can help with this issue?

dangles · 2026-10-19T20:21:18-0400

Is there any reason you aren’t just doing continuous small daily exchanges? I have mine set to exchange 2.5 gpd just during daylight hours. Haven’t had any issues.

Mr.BobDobalina · 2026-10-19T21:09:59-0400

dangles said:
Is there any reason you aren’t just doing continuous small daily exchanges? I have mine set to exchange 2.5 gpd just during daylight hours. Haven’t had any issues.

I was using auto at 2% for the past 2 weeks and that's the plan for the future, but I have added a bunch of live rock so trying to do 10% a day for a few days.

Mr.BobDobalina · 2026-10-19T21:13:17-0400

In an attempt to figure out the problem, I noticed my drain line was sucking air today. I switched the hoses on the drain side and it started working on that end. Yesterday, the hoses were reversed and it worked perfectly. This thing is possessed!