i just bought AOCEPT Plus by CIBA vision. got one metal piece
(called the AODISC) at the bottom. it will react with the hydrogen
peroxide in the solution to produce water and oxygen, leaving
behind a saline solution. cost about $14 for one big bottle with
the case.
and the brochure says that it is better to wash the case with
saline instead of tap water cos saline is sterile.