dosing pump for water change

[jacob]

Hi, i got a profilux and four dosing pump. Pump 1 and 2 dose 2 part, and i want to make my water change whit pump 3 and 4. I want to change 7.5g a week, seperate in 7 day. My problem is i can not figure how to program the pump to make it at 2am at the same time, one to take water from aqua to the drain and the other put fresh new water in aqua. Thanks

[Matthias]

the AWC can be started by a timer, please read manual regarding level control