The Gaia Shower Filter Refill Cartridge requires replacement every 3-6 months.

When you order The Gaia Shower Filter, it comes with a filter inside which lasts up to 6 months. This is the refill for when you're due a replacement. 

For single-user use, the refill should be replaced every 6 months.

When multiple people use the shower filter, we recommend to replace the cartridge every 3 months.