I was gonna say milk jug but then you can't see in it. How do you know when all the kalk has settled?

Most milk jugs I've seen have small openings which might make it harder to add heapfuls of kalk with a large spoon for a messy person like me. Also, I'm not sure how leak proof they are under pressure. They might work fine for gravity drip but may not be as good when used with a dosing pump.

I currently use a Rubbermaid container as my Kalk dispenser. I added 2 air hose fittings and attached it to my Osmolater. Works great. It has a gasket, is leakproof, and has a large opening to dump kalk in. Mine is only 2.6L.

http://www.rubbermaid.com/hpd/consum...rdMenuIndex=10

This one is however is 3.7L.

http://www.rubbermaid.com/hpd/consum...rdMenuIndex=10

Until I get a real kalk reactor, this works quite good. I put 3 teaspoons in once or twice a week and give it a good shake once in a while. The kalk dispenser sold by Tunze is almost exactly the same thing but costs $130 or more.

EDIT: Oh, I read further below and saw you are gravity dripping. So then these might be overkill?

make one out of a oceanspray cranberrry jug. it`s heavier plastic, it`s clear and it`s got a nice concave bottom so the kalk can settle around your drip tubing. :idea:

I use the blue water jugs you put purified water in. It is the rectangular one with the white water valve on it (I think it is like 2.5 galons or something like that). The hole at the top is fairly large. You can get them for pretty cheat at Superstore. Anyways, the attachment that converts the square end of a powerhead to a round end (for a hagen 301) fits perfectly in the round part of the water jug valve. I then siliconed a piece of air tubing with an air valve attached to it. It works great. To fill up the jug, I just pull of the plastic power head attachement piece and fill the jug up.

I hope this makes sense. I should see if I can get a picture of the one I built. A few people have seen it and wanted to make one as well.