Your cart
Kalk Stirrer
Kalk Stirrer
Kalk Stirrer

Kalk Stirrer

39 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 39 Reviews
5 ★
4 ★
3 ★
2 ★
1 ★
Customer Photos
Write a Review Ask a Question

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
  • products
  • Avast Marine
  • kalk stirrer
  • Unit
  • Avast
  • Works
  • problem
  • best
  • brand
  • issue
Taso P.
United States United States

Great product

Easy to use and keeps my ph at 8.4.

Dillon T.
United States United States

Excellent product Excellent service

Service from you guys at Avast was quick and easy. Bought and ordered my kalk stirrer and recieved the unit before weeks end. Look forward to utilizing more of their line up of reef equipment!!

Shawn W.
United States United States

Works as it should

So far so good 100% easier to dose my kalk then pre mixing in a jug

Michael G.
United States United States

Dash shipping excellent products

I loved getting my shipments from Avast. The products looked amazing and they are unique and well made

Dr. Timothy Foster
United States United States

Perfect saturatrd kalk

I have used the kalk stirrer for quite some time and this has worked flawlessly. Perfect silent stirring. I love avast products!