Reef Octopus CR5000D Calcium Reactor
RO-CR5000
The Super Reef Octopus CR5000D is a dual-chamber, reverse-flow calcium reactor built for large reef systems, automatically supplementing calcium and alkalinity by dissolving aragonite media with pressurized CO2. It uses...
Or build it into a bundle — save up to 6% ↓What it is, and who it is for.
The Super Reef Octopus CR5000D is a dual-chamber, reverse-flow calcium reactor built for large reef systems, automatically supplementing calcium and alkalinity by dissolving aragonite media with pressurized CO2. It uses twin 8" chambers, a Water Blaster 5000 recirculation pump, and a CO2-recirculating design for efficient media dissolution. Rated for aquariums up to 700 gallons.
Build around the Reef Octopus CR5000D Calcium Reactor.
It's already in your system below. Add the flow, filtration and dosing around it and the discount starts working — tiers climb as the build grows, and the reef meter fills with it.
Pick the right one, not the biggest one
The honest line-up from filtration. Most buyers reading this page should buy the middle column.
Reef Octopus Elite 150 INT Protein Skimmer
Reef Octopus CR5000D Calcium ReactorAsked before checkout
The questions our support inbox actually gets.
Does it ship quickly?+
Orders placed before 2 PM ET on a business day leave the same day. Tracking is emailed the moment the label prints.
What if it's the wrong fit for my tank?+
Return it. 30 days, no restocking fee, refund to the original payment method. Better: tell us your tank first and we'll spec the system for free — half of all returns are sizing problems.
Who handles the warranty?+
We do. Everything carries the manufacturer's warranty and we run the claim for you — one email to us instead of a ticket queue.
How does the bundle discount work?+
Add items in the bundle builder: 2+ items saves 5%, 3+ saves 8%, 4+ saves 12%, and 5+ saves 15% off the whole system, applied at checkout.