I would not bother trying to tune it with a gate valve. If you cant get a dual head parastaltic pump to have matching flows its just not going to work.
Trust me on this, I have made every kind of auto water changer you can think of and gave up on them all because none would work right and they would always screw up my salinity.
Trust me on this, I have made every kind of auto water changer you can think of and gave up on them all because none would work right and they would always screw up my salinity.
