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Kalk Stirrer Kit
Kalk Stirrer Kit
Kalk Stirrer Kit

Kalk Stirrer Kit

141 reviews
$ 169.99

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. Simple top load 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 new line of stirrers 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 User Manual

Click Here to Download the Assembly Manual

Customer Reviews
4.9 Based on 141 Reviews
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Eric N.
United States United States

A+ Customer Service

This is my 2nd Kalk stirrer from Avast because I liked the 1st one so much. But I had a space issue for the 2nd stirrer. Dan helped me with a custom order and got it out to me quick! When the stirrer arrived at my house, the chamber was cracked. I messaged Dan and he sent me a new one right away. A+ customer service! And an awesome product.

Avast Marine Works Kalk Stirrer Kit Review
mike o.
United States

Kalk Reactor

So I purchased the you build reactor. I wanted the complete already built but it was out of stock. I did watch the video and everything went smoothly. But i messed a section up, and had to buy 1/2” pipe. I didnt glue it, and then i tryed to pull it apart. I ended up damaging the part. Other than that i was very happy with the reactor. Thx 915Mang

William G.
United States United States

excellent. I purchased the kit which came partially assembled and with all the materials needed, including glue. Easy to assemble. Product now up and running for a couple of weeks and working great.

Adam W.
United States United States

Great Products!

This is the first time buying an Avast Marine product but definitely won’t be my last. I received my order very quick and well packaged. I purchased the Kalk stir kit and the media reactor kit. Both went together flawlessly! I am very impressed with the build quality and perforof both items!

Brian S.
United States United States


Wasnt impressed of the cut edges. Besides that, overall good product!