Product review (3 stars): Venta wash solution
Was happy to find the Venta Water Treatment Additive available on Amazon.  The Venta Airwasher/humidier is harder to find in stores now, and since we've been enjoying the product, we were afraid Additive might be hard to get.  Though it may not be essential to the use of the Airwasher and is rather overpriced, the additive does make for less calcification on the drums.