Product review (3 stars): It is sturdy and holds up very well over time
I have been using this filler for over 2 years now. It is sturdy and holds up very well over time. However this is a pricey filter compared to other available brands. If you have hard water in your area you have to use a water softener solution to improve the life of the filter. The filter hardens with salt deposits and loses its absorption capacity.  I used to go through a new filter every month. I started using the bestair golden solution from amazon http://www.amazon.com/gp/product/B000HJDA60/ref=cm_cr_ryp_prd_ttl_sol_12 which significantly increased the life of the filter. Now i replace filters only every few months