Rainwater collection/ stagnant water
when I moved into my house several years ago I inherited a recycling box that seemed to be collecting rainwater. It has sat in the corner all of this time unfortunately. It has a painted glass lid on it and is under a couple of bags of compost so is fairly concealed from the light.
I now feel I need to do something with this water as assuming it is stagnant now although it doesn't smell.
As my small garden is completely paved over I cant use it to empty over the plants and worried that as it is so old it may not be save to do so.
Any advise please.