Chris,
Thanks for the tip but I'm pretty sure that the kalk is clear. I let it sit for a few hours and only siphon out the clear layer to use. The tubing itself is clear but the end of the tubing gets calcium deposits where it drips. It seems like these deposits only occur because the drip rate is very low (~1drip every 2-3 seconds). The only way to prevent this calcium buildup would be to take the calcium out of the water (but that wouldn't work either
)
I've read a little about medical dosing pumps (like for IV's). Is anyone using these? Do they need to have a water supply hung above them or is it possible to plumb them into a tank/container like any other external pump?
Thanks again.
- Chad