A little complicated for water pillow

We ordered the tablets to water our pillows. A Product information / instructions not was, but the dealer has given to me by someone friendly information.
In the info to water pillows while standing, you need to tap water not chem. Attach accessories. But the merchants of the tablets gave us the following info:
"The temperature in the cushions is around 30 degrees and that is exactly the water temperature at which bacteria and germs like to reproduce. One tablet is enough for a pillow and there in a VE are 6 tablets, that's enough for 6 years.
If the cushion is affected only once and starts to stink, have to work with stronger chemicals and that should at
Range of daily necessities can be avoided in advance whenever possible. "
That convinced us and we have yet attached Konditinierer.
One tablet is enough for 15-20 liters of water. When water pillow (filling max. 5 L), this means 1/2 tablet per pillow. The dealer is recommended to halve the tablet carefully. That's easier said than done. The tablets crumble and it's not as simple as that "powder" to fill in the cushions. In addition, it is also not safe to touch the divided tablets with wet fingers (corrosive). There are all 6 tablets in a bag. The 5 tablets that you kept - a year is only 1 tablet is required - must be packaged so that no air and light come off. On the other hand, if you look at the price when compared to liquid Koditionierern it is still cheaper to throw away a few tablets. ;-)
The effect can be assessed so only after one year, After 2 weeks you also with clean tap water yet been no formation of bacteria.