$52.69
See if it's really the one
Search with this product to compare it, find similar styles, or turn up something better before deciding.
Looking for a refillable filter cartridge for 4x21" housings? This is it. These refillable cartridges fit the 4x21" housings from many different manufacturers. Fill with our virgin bulk DI resin to save big on your filter cost. Holds 1/10 of a cubic foot of DI resin.
Have a question about this?
We currently ship within the US, with more countries coming soon.
Final cost and dates are confirmed at checkout.
🇺🇸 Ship from USA · On Agora since 2025
$52.69