KM500ST | D-D The Aquarium Solution


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KM500ST Kalkwasser Stirrer

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 KM500ST is a stirrer suitable for larger tanks up to 6700 lts - 1500 UK gallons - 1800 USG and will produce up to 10lt - 2.6 USG of kalkwasser per hour.

Supplied with 500ml tub of RowaKalk.


Technical Data:

  • KM500ST Stirrer: Article No. 87002000
  • 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 10lt 2.5 USG of kalkwasser per hour.



  • 220mm x 220mm x 480mm (WxHxL)
  • L 8.7" W 8.7" H 19". 
  • 7.5V 3 watts consumption.



  • Suitable for aquariums up to 6700 lts - 1500 UK gallons - 1800 USG
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