Dosing system for 2 part Ca additives

[chip721]

I'm in the process of setting up a 90g mixed reef and trying to select an automatic dosing system for 2 part additives. I've setup and used a gravity fed device before using IV tubing, but don't want to use it as my final solution. I currently have a refurbished peristaltic hospital pump on my 54g. It works ok, but I don't want another. I've been looking at the Aqua Medic Twin Reefdoser and the Spectra Pure Lite Meter3. If I were only using kalk the the LM3 would be fine. But for 2 parts, it seems Lite Meter uses its built-in pump for part A, but requires you purchase a second external pump for part B. Can anyone give pros or cons on either of these based on personal experience. Or can you suggest other dosing systems you've found to be effective and reliable. Thanks

[WaterKeeper]

Chip,

The problem with many of the two part systems is that you don't dose equal parts. It therefore usually requires two separate dosing pumps to accomplish the task. I guess you could dilute the stronger part to match concentration with the weaker but that might be more trouble than it is worth. Maybe someone else will have a different solution.

[chip721]

<a href=showthread.php?s=&postid=7062795#post7062795 target=_blank>Originally posted</a> by WaterKeeper
Chip,

The problem with many of the two part systems is that you don't dose equal parts. It therefore usually requires two separate dosing pumps to accomplish the task.
Waterkeeper, that's exactly why I don't want another hospital pump. It uses twin lines on the same pump head and things do get out of balance.