DOSING PUMP ADVICE AQUAMEDIC EVO4

[josh-jonees]

Trying to dose equally is hard with this aquamedic evo 4 noticed my alk reservoir dropping faster than my calcium, calibrated it today but did a 10ml test and got 19ml #1 and 14ml #2 is there anyway to fix or do i need a new pump? I've had it for almost 2 years but only just noticed this going on, I'm trying to dose my ati essentials equally, thanks

 

[reefwiser]

The lines for the pump need to be replaced
they are worn. Causing inconsistent pumping.

 

[josh-jonees]

Is that the line that goes inside the motor or my dosing lines? As I replaced my dosing lines not long ago, also all 4 motors seem to make a different sound when running

 

[reefwiser]

Yes, it is those lines. There are rollers inside each pump and on these cheaper models, they don't use anything but a piece of plastic. Which wears out fast. A head needs to be replaced.
If you like using a dosing pump I would buy a GHL Doser where you can actually get replacement parts for the heads. I have 8 of them in my systems and keep spare heads in case I need to repair one.