The Atlas Filtri PFAS ARMOR 20” BIG cartridge (811901) is a specialised whole-house filtration cartridge designed specifically for PFAS reduction, along with general chemical improvement of mains water.
It’s one of the more advanced single-cartridge options in the Atlas Filtri range, typically used inside 20” BIG mono, duo, or trio housings like the ones you’ve been looking at.
This cartridge is designed to target:
PFAS (PFOA & PFOS reduction)
Chlorine reduction
Taste and odour improvement
General chemical polishing of mains water
It uses a proprietary activated carbon-based media with high contact efficiency, rather than standard sediment or basic carbon block filtration.
Flow rate: ~30 L/min
Micron rating: ~1 micron
Capacity: ~113,400 litres
Temperature range: 4°C – 45°C
In practical household terms, it’s sized for:
a typical family home (1–3 bathrooms),
whole-house use (showers, laundry, kitchen),
moderate-to-high mains water flow setups.
This is important because it’s not a standalone “everything filter”.
Final or mid-stage chemical filtration
After:
sediment removal (to protect it from clogging)
sometimes carbon pre-filtration (depending on setup)
10–90 micron sediment filters (Stage 1)
additional carbon or PFAS stage (Stage 2 or 3 in duo/trio housings)
That’s why you see it bundled in:
mono PFAS kits (1 cartridge)
duo systems (2 cartridges in series)
trio systems (PFAS + sediment + prefiltration)
This cartridge is strong in:
1. PFAS-specific targeting
Not all carbon filters meaningfully address PFAS—this one is designed and tested for it.
2. Whole-house usability
Unlike undersink RO systems, it treats every outlet in the home.
3. High flow capacity
30 L/min is solid for showers + appliances running together.
The Atlas Filtri PFAS ARMOR 20” BIG cartridge (811901) is a specialised whole-house filtration cartridge designed specifically for PFAS reduction, along with general chemical improvement of mains water.
It’s one of the more advanced single-cartridge options in the Atlas Filtri range, typically used inside 20” BIG mono, duo, or trio housings like the ones you’ve been looking at.
This cartridge is designed to target:
PFAS (PFOA & PFOS reduction)
Chlorine reduction
Taste and odour improvement
General chemical polishing of mains water
It uses a proprietary activated carbon-based media with high contact efficiency, rather than standard sediment or basic carbon block filtration.
Flow rate: ~30 L/min
Micron rating: ~1 micron
Capacity: ~113,400 litres
Temperature range: 4°C – 45°C
In practical household terms, it’s sized for:
a typical family home (1–3 bathrooms),
whole-house use (showers, laundry, kitchen),
moderate-to-high mains water flow setups.
This is important because it’s not a standalone “everything filter”.
Final or mid-stage chemical filtration
After:
sediment removal (to protect it from clogging)
sometimes carbon pre-filtration (depending on setup)
10–90 micron sediment filters (Stage 1)
additional carbon or PFAS stage (Stage 2 or 3 in duo/trio housings)
That’s why you see it bundled in:
mono PFAS kits (1 cartridge)
duo systems (2 cartridges in series)
trio systems (PFAS + sediment + prefiltration)
This cartridge is strong in:
1. PFAS-specific targeting
Not all carbon filters meaningfully address PFAS—this one is designed and tested for it.
2. Whole-house usability
Unlike undersink RO systems, it treats every outlet in the home.
3. High flow capacity
30 L/min is solid for showers + appliances running together.