Growmax Replacement Filter Packs — Carbon Block & Sediment Filtration for Hydroponics
Best for: Growers maintaining Growmax water filtration systems who need reliable replacement cartridges without the premium markup
Our thoughts
Water quality matters more than people think. Bad water means salt buildup, root stress, and wasted nutrients. These filter packs do proper work — coconut carbon, decent sediment filtration, and they're priced sensibly. The kind of consumable you actually want to replace on schedule, not skip to save a few quid.
The Growmax replacement filter pack is your consumable maintenance solution for keeping water filtration systems running cleanly and efficiently. It bundles a green coconut carbon block filter with a 5-micron sediment filter — the two-stage approach that removes 99% of chlorine, volatile organic compounds (VOCs), and sediment down to 5 microns. Designed as a drop-in replacement for Growmax Eco Grow, Power Grow 500, Mega Grow 1000, and Maxquarium systems, these are the cartridges that keep your water pure and your system free from calcium deposits and salt buildup.
How it compares
Two-stage carbon block and sediment filtration is the industry standard for hydroponics water treatment.
- Coconut carbon is eco-friendly and has superior micro-pore structure compared to standard activated carbon
- 5-micron sediment filtration handles chlorine, VOCs, and particulates in one go
- 12,000-litre capacity means you're getting solid run-length per cartridge set
- Significantly cheaper than premium reverse osmosis systems from HydroLogic or LiquaGen, while delivering the same core filtration performance
This sits in the sweet spot where you're getting proven two-stage filtration at a price that doesn't sting every 4–6 months when you need to replace.
Usage guidance
These are replacement cartridges, not a standalone system. They slot into your existing Growmax water filter:
Before installation
Turn off your water supply. Release pressure from the housing. Replace both cartridges at the same time — don't swap them individually. Flush the new filters through for 5–10 minutes before connecting to your system.
Replacement schedule
Change filters every 4–6 months depending on your incoming water quality and usage volume. If you're running year-round or in an area with high sediment or chlorine, every 4 months is safer. Growers in softer water areas can sometimes stretch to 6.
Why regular replacement matters
Unfiltered or partially filtered tap water introduces chlorine, sediment, and dissolved salts into your growing system. Over time, this clogs lines, damages plant roots, slows growth, and makes precise nutrient management impossible. Swapping these cartridges on schedule keeps your water starting from a clean slate — which means better nutrient uptake, fewer salt deposits, and less system maintenance overall.
Technical specifications
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Contents: One green coconut carbon block filter + one 5-micron sediment filter
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Filter size: 10 inches (standard)
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Filtration capacity: 12,000 litres per cartridge set
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Chlorine removal: Up to 99%
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VOC removal: Up to 99% of volatile organic compounds
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Sediment filtration: Down to 5 microns
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Carbon material: Green coconut shell carbon block with high micro-pore structure
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Recommended replacement interval: Every 4–6 months
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Warranty: One year on Growmax replacement components
Who this is for
- Growers with existing Growmax Eco Grow, Power Grow 500, Mega Grow 1000, or Maxquarium systems
- Anyone running hydroponics who wants to eliminate chlorine and sediment without overcomplicating things
- Growers in areas with poor tap water quality (high chlorine, sediment, or dissolved salts)
- Budget-conscious operators who understand that clean water is cheap insurance against system problems
- Seasonal growers planning year-round cultivation who need predictable, routine maintenance consumables
Our take
Water filtration is one of those things that feels optional until your system clogs or your nutrients stop working properly. These cartridges are cheap compared to what it costs to fix a neglected filter or replace a damaged system, and coconut carbon is genuinely better at the job than standard activated carbon.
If you're running a Growmax system, worth picking up while clearance stock lasts. Set a calendar reminder for every 4–6 months and swap them without thinking. Does exactly what it should — removes what shouldn't be there, leaves your water clean, and keeps your grow on track.
