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I just picked up a geo 818, literally Friday. I can let you know how it goes.
BTW my sys is 450-460
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GEO 818 on my 500 gallon system with a 155 gallon sump.
Built like a tank, and holds 24# of media. I wouldn't change a thing. And GEO has great customer service.Any cons or things you would change?
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Aquarium Engineering makes a great calcium reactor.. I got one and I love it.. there are no uni-seals. all fittings are taped and all seams are glued.. the plate inside the reactor can be removed so you can clean the bottom from any crap the settled down to the bottom. he will also costumize it for you if you wanted it done,, I had him add the 2 inch port into the lid that you see here.. the probe port has a valve so no more leaks when you want to recalibrate your probe.. this is also a recirculating skimmer so it used less CO2. the foot print is 7.5 x 14. if you want to check out his page you can email in from there or call him from there.. if you cant let me know and I can get you a email and number.. this is the best reactor I have ever had. an other thing about this reactor is it will never get an air bubbles into the exit tube that throws off your measurements. the exit water is actually taken from the probe in the picture that hangs down into the reactor about 4 inches so you get only water and no air. my reactor is rated for 500g.. he also makes bigger if you want bigger

