I realised my directions may not be 100% clear. When I refered to "4 inches down from the top" I meant holding just the lid in a vertical angle, 4 inches from the top of the lid and 4 inches in from the side of the lid. Don't make an incision on the side of the tub unless adding some filtering device otherwise making it escape proof and water proof gets in the "too hard category," at least for me.

Again, good luck.