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Calcium Reactors

Calcium Reactors offer an easy and convenient method for maintaining the desirable levels of both calcium and alkalinity in a reef tank. After the initial setup and tuning, calcium reactors require very little maintenance, and are a popular choice for reef tanks heavily stocked with SPS. Simply put, a calcium reactor is a chamber filled with calcium carbonate media, over which pass a combination of aquarium water and carbon dioxide. The addition of carbon dioxide to the aquarium water in the calcium reactor, lowers the pH inside the reactor, making the water acidic. This acidity dissolves the calcium carbonate, and when put back in the aquarium, replenishes both calcium and alkalinity.

Geo’s Reef Calcium Reactor 618

 Posted on Wednesday, May 20th, 2009 at 2:16 pm

geos-reef-cr-618Calcium Reactor 618

  • All cell cast acrylic construction
  • Clear lid to view proper O-ring seal
  • Key hole slot for lid removal
  • Full access to the reaction chamber (union tops do not provide this,
  • Micro ball valve effluent control
  • Eheim 1048 pump, bolted to base plate
  • pH probe port in lid
  • pH probe adapter included
  • Auto fill bubble counter
  • 10 x 9 foot print, 24″ overall height
  • Holds 12 pounds of media, we recommend large grain schuran type
  • For reef aquariums up to 350 gallons


    • The world famous GEO calcium reactor!

Our reactors are fabricated using only the finest cast acrylic materials and high quality fittings. Designed with the user in mind, we feel these are by far the easiest reactors on the market to install, operate and maintain. Bottom up flow of water captures free CO2 and draws it back into the pump. This means less gas in the reactor and less gas in the effluent. There is no need for a second single pass chamber with our design.

These reactors include all of the fittings and tube required for normal installation. The user will need to supply the media, CO2 equipment and feed pump.

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