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Aquarium Supplies
Home » Saltwater Aquarium Supplies  » Calcium Reactors  » Kalkwasser Reactors  »  Deltec KM500 Kalkwasser Stirrer holds 500g Calcium Hydroxide
Deltec KM500 Kalkwasser Stirrer holds 500g Calcium Hydroxide

Deltec KM500 Kalkwasser Stirrer holds 500g Calcium Hydroxide

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Deltec KM500 Kalkwasser Stirrer holds 500g Calcium Hydroxide Information

Kalkwasser - Translates from the German for limewater and is a solution made by dissolving Calcium Hydroxide in water. The resultant fresh solution is alkaline with a pH of 12.4 and contains a ready supply of both Calcium ions and Carbonate ions.
The solution reacts readily with CO2 in the atmosphere to form calcium carbonate and so it must be made in a relatively air tight environment which is where the kalkwasser stirrer comes in to play.

The KM500T is the standard stirrer suitable for tanks up to 1500 lts (350 UK gallons) and will produce up to 5lt of kalkwasser per hour.

Technical Data:

Can be stood on the outside of the aquarium or sump.
Must gravity feed back into the water supply.
Feed with RO water from a reservoir or direct from the RO unit.
Use in conjunction with a top up system.
Supplied with 500ml tub of RowaKalk.
Makes up to 5lt of kalkwasser per hour.


L 150mm W 150mm H 480mm.
7.5V 3 watts consumption.


Suitable for aquariums up to 1500 lts (350 UK gallons)

Deltec KM500 Kalkwasser Stirrer holds 500g Calcium Hydroxide Reviews

Average Rating
(3 reviews)
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WOW, what a machine

Reviewers Rating Excellent!

Posted: 8/10/2009 from BELMONT, CA UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: First I thought why should I spend that much money for a stirrer, after talking to a few expert and now using it for a week or so, I can see why. This stirres instead of using power head type pump to "mix" the kalkwasser. The solution entering the tank does not contain undissolved lime where the power head pump design may. The built quality is good, well thought out. The hose that connects between the lower bulkhead and exit nozzle assembly should be hard plumb to reduce an area of failure. Other than that, other than the cost, it is a great machine.

4 of 5 People found this review helpful, did you? Yes No

700 usd tube with stick

Reviewers Rating Below Average

Posted: 1/27/2009 from GREENSBORO, NC UNITED STATES
2.0 5
Experience Level: Expert

Comments: While this is a simple design that is superior to any device subjecting kalk to an impeller it is just plain offensive to charge 500 dollars for a tube with a stick requiring proprietary replacement parts. It's acrylic a plastic not a precious metal.

10 of 15 People found this review helpful, did you? Yes No

Great Design!!!

Reviewers Rating Excellent!

Posted: 5/9/2008 from SoCal
5.0 5
Experience Level: Expert

Comments: Very Simple Design that works well.

1 of 25 People found this review helpful, did you? Yes No

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