While it is okay to pour boiling water down sink drains, you should never use boiling water in your toilet, as the heat can cause the porcelain to crack. Instead, run your tub until the water is hot and fill a good-sized stockpot or bucket with it.
Pour Hot Water into the Toilet
If you need to heat some in the microwave or the stovetop, you don't want it to reach boiling temperatures. Boiling water can cause toilet porcelain to crack. Allow the hot fluid to sit in the toilet for a few minutes to loosen the clog.
Hot Water and Dish Soap
When the water is extremely hot, but not boiling, pour into the toilet carefully. Wait for 10-15 minutes while the dish soap and hot water soften the clog. Once you do so, the toilet will unclog and flush freely.
Drainpipes are not that strong against heat. Please chill the water before pouring it down the drain. Don't pour boiling water!
Pouring boiling water down the drain to unclog it most likely won't work. Sure, there's a very small chance it could loosen the clog, but there's a larger risk of softening or melting PVC joints.
Make sure you run hot water at least once a week. However, there's one time when you should run cold water, not hot: when you run your disposal. When you run your disposal with hot water, the hot water could cause the grease to melt and coat the drain.
For tough clogs, use a full cup. While that sits, bring a half pot of water (about 4 cups) to boil. Pour this directly into the drain very slowly but steadily to avoid getting burned by splashing water. Allow to sit for 10 to 15 minutes, then run water down the drain to check how freely water flows.
Pour Boiling Water Down the Drain- Fruit flies can usually survive typical water flow down the drain, but boiling some hot water and pouring it down can kill flies and their eggs. Peptanks points out that this may be done a few times a week for a couple of weeks to make sure you kill any future generations of flies.
Caustic Soda
Caustic soda is a nasty chemical that can burn, but it's very effective for unclogging toilets. To use this chemical, you need to get some rubber gloves and eye protection. You can pick the chemical from the local hardware or grocery stores.
The best way is to pour some bleach and washing liquid into the toilet bowl and swirl the plunger for a few minutes in the mixture. Then rinse it by flushing the toilet twice. This will also help move the blockage forward.
Make your own drain cleaner by pouring one cup of baking soda and two cups of vinegar into the toilet and adding a half gallon of hot water. Dish soap can also help loosen some obstructions. When using either method, allow the solution to sit overnight and then flush the toilet to see if the obstruction has cleared.
Drain flies thrive in stagnant and standing water. Common sources include slow or clogged drains, rarely used and unused toilets, refrigerator drain pans, and standing water created by leaking pipes. They typically enter buildings through basements, windows, and drains.
Craft an All-Natural Fly Trap
To make an all-natural drain fly trap, fill a bowl with apple cider vinegar and cover it with plastic wrap. Punch small holes in the wrapping. The vinegar's smell will attract the drain flies, and the wrap will trap them inside the bowl.
Mix together 1/2 cup of salt, 1/2 cup baking soda and 1 cup of vinegar. Pour the mixture down the drain. Let sit overnight, then flush the drain with hot water in the morning. This should kill all flies and the organic material they've been feeding on.
Disadvantages of Boiling Water
Boiling water can only remove bacteria, meaning it will not remove harmful substances such as chlorine and heavy metals such as lead from tap water. Boiling tap water with lead actually concentrates this contaminant making it more dangerous than if left alone.
Boiling water takes forever, so you decide to speed things up by filling the pot with scalding hot tap water instead of cold. DON'T DO IT! Why? Well, because your hot water from the tap can contain contaminants.
Although, some bacterial spores not typically associated with water borne disease are capable of surviving boiling conditions (e.g. clostridium and bacillus spores), research shows that water borne pathogens are inactivated or killed at temperatures below boiling (212°F or 100°C).
Will Boiling Water Damage 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.
Once a week, flush your drain by boiling a large pot of water. Pour one-half of the pot down the drain. Wait five minutes and pour the rest. It's a simple thing that can help dislodge any grease or debris lurking in your drain.
For stubborn clogs: baking soda, salt, and vinegar
To clean your drain with baking soda, salt and vinegar, mix half a cup of baking soda with half a cup of salt and pour the mixture down the drain. Boil 1 cup of vinegar and pour it down the drain — the combination will cause a fizzy and bubbly chemical reaction.
Water that hasn't been boiled can also contain bacteria. Formula therefore needs to be made up with water hot enough to kill the bacteria, which is at least 70 degrees C. This means boiling the kettle and leaving it to cool for no longer than 30 minutes, so that it remains at a temperature of at least 70 degrees C.
Boiling the water kills microorganisms such as bacteria, viruses, or protozoans that can cause disease. Boiling makes the tap water microbiologically safe.
Baking soda and vinegar – put one cup of baking soda into the blocked toilet and wait two minutes. Afterwards, slowly pour two cups of vinegar and wait a few minutes before flushing the toilet. Dish soap and water – put dish soap, then hot water into the toilet.