Bought this at an lfs for like $5 and figured j could use it as a ato container. cleaned and ready to go. just need a pump. only thing is I wanted to add kalkwasser to my system till I can get the money for a full blown doser setup. how would I go about this, with just the 2 lil holes. just a lil bit bigger then a pen. edit: also it doesn't open. it's been chemically bonded on all sides.