Product review (3 stars): Cracked the code for cheap Venta water treatment additive & cheap Venta cleaner!
Personally, I ended up buying the higher-tech and less pricey Winix AW600 air washing machine, also sold on Amazon. However, I think the Venta water additive & Venta cleaner are great product ideas that Winix does not make or sell. Being budget-minded, having bought a machine that works as well/better than a Venta (no squeaky transmission for driving the discs! I used to own a Venta but returned it), with more features, for 2/3 the price, I next set out to investigate ways to reduce costs on the water treatment additive & cleaner.

After reading all the Amazon reviews, Amazon customer questions, plus reading other informational posts found via Googling, I think Ive cracked the code.

Venta water treatment additive (homemade) recipe:
- Distilled water + Steramine Quaternary Sanitizing Tablets + dishwasher rinse-aid.

All this can be purchased on Amazon.com.

As to other homemade Venta water treatment additive recipes, one Amazon comment said the poster spoke with a Venta rep and was told that using soap + vinegar as a replacement solution, would be breathed in by the user. I am pretty sure this negative effect would only apply to the ultrasonic Venta, not the Venta airwasher that uses rotating plastic discs and a natural evaporative process to humidify.

As to Venta cleaner, there are a number of cheap solutions. It is recommended to run machine outside or in a garage (i.e. due to smells) for an hour or two with the tank full of homemade cleaner, then rinse out tank and discs thoroughly, then re-fill with clean water and water treatment additive before putting machine back into service.

Venta cleaner (homemade) recipes:
- Vinegar + water
- Lemon juice + water
- Calgon (or other brand) water softener powder for washing machines + water

Feedback is welcome, I will be checking this post to see if I should modify the recipes with your suggested improvements.