It’s perfectly acceptable to run hot water down the drain after you’ve used the disposal. However, it is even more important that only cold water be used during the food grinding process. Don’t put grease, fat or items of this type in the disposal. These will cause the drain line to clog.Click to see full answer. Beside this, is it OK to dump boiling water down the drain? Do NOT pour boiling water down your sink or toilet. While it’s probably okay to dump boiling water in the sink when your pipes are clear, a clog will trap the water in the pipe. This can melt PVC piping and pipe seals, causing serious damage.Similarly, how do you dispose of hot water? Contact city or county officials or the local waste management department to find out if your area has an appliance recycling program. If it does, take the hot water heater to the designated location. Alternatively, find out if you can place the hot water heater with your regular trash on a community recycling day. Keeping this in consideration, should you run water when using garbage disposal? YES. You must run a good flow of water until the grinding has stopped. In fact, it is a good idea to run cold water down the disposal before grinding food particles and then also after the grinding has stopped as well.Can you put boiling water down PVC pipes?The general rule of thumb is that hot boiling water can soften or even slightly melt the joints in your PVC pipes so YES, if you subject these types of pipes to high temperature water on a regular basis – they can be damaged, causing leaks and eventually requiring replacement.