Well you obviously seem to know what I should be spending my money on  ::)

However, as the cubos hold a total of 2000 litres and mostly used on the garden, except in emergencies, I still believe this is not the best use of my money, or probably disinfectant tablets.

You will also find that not everyone on this forum is of retirement age and saving for caskets. Although I can´t actually imagine anyone on here saving for their casket.
Btw, welcome to the area  :-/