Doesn't like Kool-Aid
Join Date: Feb 2003
Location: Hawthorne, New Jersey
I think I might be a bit careful about adding a ball valve to that system to slow down the filter flow. I am not sure how much back pressure the Via Aqua can handle. I would do it on an Eheim or a Rena possibly, but I am not sure the Via Aqua can handle it. Too much and it could cause the filter to leak.
A safer way to reduce the flow would be to increase the size of the tubing after the heater as the water returns to the aquarium. Like going from 1/2" to 5/8". That will slow down the flow as it enters the aquarium and cause no back pressure on the filter.