I found these in Robert Dayas a few months ago and thought they were great. You just put one capsule into the bottle add water and watch it dissolve. Then its ready to use.

They do one for the kitchen, glass and bathroom.

When it runs out you just buy new capsules there is no need to buy any more bottles, it does say up to 20 usages but i will try and get as much out of the bottle as possible.

My only issue is that there is no were to recycle the plastic surrounding the refills. However this is smaller than bottles and lids on refills.