Granular Activated Carbon Filter
by Reef Pure RO — see more →SKU 740528974741
- Ships Australia-wide — fast dispatch from Eastwood
- Or collect in store with the rest of your order
- Genuine stock — marine specialists since 2012
Overview
Tap water is treated to be safe to drink, not safe for a reef. Chlorine and chloramine are dosed into mains supply by design, and along with them comes a load of volatile organic compounds — benzene, trichloroethylene and other petroleum-based contaminants. Left unchecked, chloramine in particular will chew through an RO membrane and permanently destroy its rejection rate.
This PurePro granular activated carbon (GAC) cartridge is the stage that stops that happening. It sits in your RO or RO/DI unit ahead of the membrane and adsorbs chlorine, chloramine and VOCs before they ever reach it — protecting an expensive membrane and making sure the water going into your mixing barrel is genuinely clean.
Key features
- High-capacity chlorine and chloramine removal — handles even heavily treated mains supply, which is where a lot of cheaper carbon stages fall short.
- Removes volatile organic compounds including benzene, trichloroethylene and other petroleum-based contaminants that have no business in a reef.
- Protects your RO membrane — chloramine breakthrough causes permanent, unrecoverable damage to membrane rejection. This cartridge is the cheap part that protects the expensive part.
- Enormous internal surface area — the loose granular bed gives contaminants far more contact area than the media volume suggests.
- Works alongside a carbon block — GAC does the bulk of the heavy lifting on chlorine and chloramine, letting the downstream block stage polish rather than struggle.
- Well-established, proven technology — granular activated carbon has been the backbone of point-of-use water treatment for decades. No gimmicks.
What's in the box
- 1 x PurePro granular activated carbon replacement cartridge
Who it's for
Anyone running an RO or RO/DI unit to make their own saltwater and top-up. That's most reef keepers past their first few months — once you're mixing your own salt rather than buying it, your water quality is only as good as your pre-filtration.
It matters most if you're on chloraminated mains supply, which covers a lot of Sydney and metro NSW. Chloramine is far more stubborn than free chlorine and won't gas off, so a capable carbon stage isn't optional. It's equally relevant on heavily stocked SPS systems where you're pushing volume through the unit for regular water changes and automatic top-up.
Setup & tips
- Flush it before it feeds the membrane. Run the new cartridge to drain until the water runs clear — fresh granular carbon sheds fine dust that you don't want packing against your membrane or sediment stage.
- Order matters. Sediment first, then carbon, then the membrane. Putting carbon ahead of sediment means grit and rust clog the carbon bed prematurely.
- Replace on a schedule, not on appearance. Exhausted carbon looks exactly like fresh carbon. Once its capacity is used up it passes chloramine straight through, and by the time you notice a drop in membrane performance the damage is done.
- Change it more often on hard-working systems. Higher water use, warmer inlet temperatures and heavily treated supply all shorten cartridge life — err on the early side rather than pushing it.
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