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Kalk Stirrer
Kalk Stirrer
Kalk Stirrer

Kalk Stirrer

55 reviews
$ 249.99

The new motor driven design of our stirrer silently and gently mixes your calcium hydroxide 24 hours a day. This ensures that you are always dosing the freshest possible kalkwasser to your system. Since the undissolved particles are always kept at the bottom and the clear liquid is always at the top, this is the safest available way to dose kalkwasser. The simple top loading design reduces the amount of time spent adding kalk powder to the reactor, which can be refilled in less than 1 minute.

No more powerheads to clean or replace, no more large vats of lime water taking up valuable space next to your tank. Once you try our stirrer you'll never look at kalkwasser the same again.

Note that our stirrers are non-pressurized chambers; water enters through a 1/4" John Guest fitting in the lid and gravity drains out into your sump through the 1/2" union barb fitting in the side. The lid is not fixed in place; it lifts off for quick and easy kalk powder refills.

If you plan to install a kalk stirrer in your auto top-off system, we recommend this small valve to control the output of the pump to a fast drip.  If you have a Tunze ATO, use this fitting to connect their tubing to the pushlock connector on the lid of the stirrer.  Please see the kalk stirrer manual for additional installation tips and ideas.


 Technical Data K1 K2
Tank Rating 400 Gallons 800 Gallons
Output capacity 7 Gallons/day 14 Gallons/day
Footprint 5.5" x 5.5" 7" x 7"
Height 21" 21"
Power AC 120v 3w AC 120v 3w
Warranty 1 year 1 year


Click Here to Download the Manual

Customer Reviews
4.9 Based on 55 Reviews
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Ken O.
United States United States

Amazing Kalk Stirrer

I was using a DIY kalk stirrer I made from media reactor I had. The Avast Kalk Stirrer blew my DIY unit away. If you are on the fence, just get it, you won't be disappointed.

Avast Marine Works Kalk Stirrer Review
Douglas R.
United States United States

High Marks for these guys

Their customer support is just like the products they build…. Stellar

Avast Marine Works Kalk Stirrer Review
Dennis W.
United States


Very easy to setup & get running. Great doing Business with you all. Thanks

Christopher C.
United States United States

Extremely satisfied

This product is awesome! Build quality 100% easy to put together works perfectly right out of the box highly recommend this to anyone who wants to start using KalkWasser

Charles G.
United States United States


Extremely easy to setup and able to dose more then the other Kalk stirrer on the market.