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I can tell you from in the field experience since I work with almost all these brands in field there is no comparison between GEO Calcium reactors and the ones you are talking about. GEO's are that much better built. Its much better built then those German "Pop Cans". Also there is no "Options" on Georges reactors. He includes it all. Probe holder, tubing, check valves, bubble counters the who sha bang a bang. He does us however use a german Ehiem pump! haa
Again if you go with a Geo you wont be sorry but choose your C02 regulator carefully as well as your Ph Controller since they are what dial in your reactor percisely.
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