Which Power Bar should I get?

[hitechboy]

After manual testing of my "Auto Water Change" setup. I cannot get it to work. I am unable to stop water flow from the aquarium! So I order a GHL slave doser instead of the powerbar to see if I can do small water change (my tank is only 25G) daily with it instead of a weekly large water change.

If you have any idea to make it work with a pump, please let me know. I'll use the doser for dosing only to save some wear and tear from it. Thank you.