Amazon with Kitsch LLC has the Kitsch Shower Head Filter for Hard Water (Chrome, ‎64396) on sale for $40 - 50% off coupon (check "Save an extra" box, eligible on first S&S order for this product) - 10% off with Subscribe & Save (can cancel anytime) = $16 with free shipping on $35+ or with Prime. Filters up to 7000 gallons of water.