Grease and oil- While it may be tempting at times to pour down all the used oil from the frying pan down the drain, this practice should be abandoned fast. Greases, oils, and fats from cooking can cause huge problems in the long run, as they’re known to solidify over time. Once the solidified grease accumulates, they can clog pipes entirely and even disrupt natural waterway balances and interfere with plants and wildlife.
Medicines- Old and unwanted medicines of any type— be they tablet, pill, or syrup— should never be flushed down the toilet. While tablets and pills will simply melt and syrups will wash off, the chemicals in them can cause toxic contamination of natural waterways. Throwing out expired medicines as solid trash is much more ideal for environmental safety.