Calc reactor and dosing pump to control drip rate

[fishresponse]

I've read on here that some use a dosing pump to control the effluent drip rate on their calcium reactors. I understand why but is it absolutely necessary? I'm about to purchase a Geo Ca/rx and want to get some feedback if I also need to get one as well?

Thanks
Andy

[Greg 45]

I have a MTC that doesn't use a persitic pump if that helps

[fishresponse]

Thanks - anyone else use or not use one?