Product review (4 stars): Venta Airwasher Water Treatment additive
I usually buy most of my products through Amazon Prime and love the free shipping.  However, the most economical way to buy the additive is through Bed Bath and Beyond.  I save the BB&B coupons I receive in the mail and when I have 4 of the $5.00 coupons I go to the local BB&B store and buy 4 bottles: 32oz each @  $16.99 minus $5.00 coupon for each and even with the shipping of $7.99 and tax of $3.00 (Massachusetts) my total last week for 4 was $58.95.  That's $14.74 each!  We have 4 Ventas and use the additive every 2 weeks cleaning the base and paddle wheel each time and the blades once each year.  Cannot live without it!