Product review (5 stars): Effective filter at a fraction of the cost
I had to twist a little harder than expected to install the filter, but the accompanying instructions explained that this was to ensure the best gasket seal.  After soaking the filter in water, a instructed, it worked like a dream.  I use fridge-filtered water for a final rinse on my hair (heated, of course) and can tell a big difference to softness and shine, so I know it's filtering out unwanted chemicals.  I'll buy from this seller regularly!