How to Remove Calcium Buildup in Pipes

A faucet suffering from low water pressure due to limescale buildup.
  • 4-8 hours
  • Intermediate
  • 750-1,500
What You'll Need
Water softener system
CLR or any similar chemical product
Gloves and protective eyewear
Baking soda
What You'll Need
Water softener system
CLR or any similar chemical product
Gloves and protective eyewear
Baking soda

Calcium buildup in your pipes can be quite a nuisance. Even worse, though, is ignoring the problem and simply dealing with slow water flow and draining issues. Ignoring a limescale problem can turn a nuisance into a downright nightmare for your bank account. So, what can be done about the problem without costing you a fortune?

Water Softening Systems

First of all, there are a few ways to remove limescale and mineral accumulation in your pipes. The best way is to permanently fix the problem by purchasing a water softening system that will prevent calcium buildup from occurring. These systems can be expensive, but to keep costs down, you can install them yourself. If you do decide to go this route, you'll still need to clean out the minerals that are currently plaguing your pipes.

Option 1: Chemicals

chemical bottle

One way to remove unwanted calcium buildup is to purchase a product like CLR. This is a product with an acid that is engineered to cut through calcium, limescale, and other minerals to deep clean your pipes. This chemical can be quite pricey, but if you can find a generic version or a hydrochloric acid product (dilute according to the brand's instructions), you may be able to make this DIY project cost-effective.

Another issue some have with this chemical has to do more with the particular plumbing system than the chemicals themselves. For example, if you have a well, you don't want this caustic chemical going back into your potable water. If that's the case, you’ll want to use a natural alternative to clean out your pipes.

Option 2: Vinegar and Baking Soda

ingredients for cleanser

Option two uses a good old vinegar and baking soda mix to clean the calcium buildup out of your plumbing. This is the cheapest and safest method, but it will take a lot of mixture and a lot more time to complete than an acid-based cleaner. If you go this route, you'll want approximately 2 to 3 gallons of white vinegar for a 1,000 square foot home and about one cup of baking soda per drain.

Note: You can opt for a vinegar only approach as the baking soda isn't a must, but it will help the process go smoother, faster, and be more effective.

Removing Buildup

No matter what option you chose to remove your limescale or calcium buildup, you will follow the same steps as outlined below. The only difference you’ll face between options is time. For vinegar and baking soda to work effectively, you'll need to allow the pipes to soak for at least three to four hours. When using a store-bought acid product, the process only takes 10-15 minutes.

Step 1 - Fill Pots of Water

You’ll need to fill a large pot of water for each sink or shower drain you will be treating. Then set the pots aside.

Step 2 - Shut Off Water

outdoor water valve

Turn off the water to your house before filling your pipes with either solution. Also turn off the breaker to your water heater so that it won't burn up while no water is coming in or flowing through.

Step 3 - Empty Your Pipes

Turn on the taps in all areas of your home, including your outdoor hoses, to allow all water to drain out of the pipes. Flush toilets as well. Turn off all the taps once all the water is drained.

Note: If you're using the vinegar to clean, remember that you'll be waiting three to four hours to use any of the taps in your home again, so fill water jugs if you'll need water for any household chores or conveniences.

Step 4 - Fill Your Pipes

cleaning sink drain

Now it's time for the fun part, pouring your choice of limescale and mineral dissolvent into the drain.

If you're using CLR or another highly acidic option, use goggles and gloves before working with the product so that it won't splash back on you and harm your skin or eyes. Use a funnel and pour the solution carefully down all your drains.

If you're using a natural vinegar and baking soda solution, you will put each product down the plumbing separately. Go to each sink and put in one cup of baking soda. Then slowly pour as much vinegar as each sink will hold. Let this sit. You should expect the mixture to bubble and fizz.

Step 5 - Clean

While you're waiting for the cleaning solution to do its job, you can remove shower heads and place them in extra bowls of the solution to clean off limescale and mineral deposits, around 10 minutes for the CLR and 3 hours for vinegar and baking soda. Scrub if needed and rinse before reattaching it.

Step 6 - Blast with Boiling Water

boiling water in an aluminum pot

Before you turned off the water, you set aside pots of water. Boil a large pot of water, one for each drain, for about 30 minutes before your solution is set to be done cleaning. Then pour the boiling water quickly and forcefully down the drains. This will help to dissolve any grease or soap leftover, sanitize your sinks, and wash away leftover calcium buildup.

Step 7 - Flush

In case you forgot earlier, make sure all your taps are turned off, or else you’ll be having water flowing everywhere once you turn your water and your water heater breaker back on. One by one, open all of your faucets at full blast so that the limescale deposits you just soaked will emerge from them.

It is normal to see calcium buildup and limescale chunks. However, some may be sitting at the bottom of pipes in powder form. You may want to consider opening up the drain pipes below your sinks and clean the p-traps out as much of the debris will settle in there.

If you have so much calcium buildup that either of the above options didn't work, you may need to remove the most affected pipes and soak them in the acid or vinegar solution. If they're too far gone, you may need to replace them, which can happen if limescale and mineral accumulation has gone unattended for a long period of time.

Hopefully one these solutions helped to remove calcium buildup from your pipes. If you repeat the process at least once a year (if you don't get a water softener system), you'll keep your wallet and your pipes happy.

Remove Calcium Buildup FAQ

How do you Decalcify pipes?

One of the best ways to decalcify pipes is to either turn off an electric water heater or turn a gas-powered water heater to the pilot position. First, turn off the water supply.

Attach a garden hose to the bottom valve on the heater and turn on the hot water faucets for every faucet and bathtub/shower you have. Drain about two gallons of water from the tank, letting it run through the hose and to some outside location or into a sink where it can drain.

Pour two gallons of white vinegar directly into the hot water tank. Let the hot water run everywhere for at least one hour, allowing the vinegar to go through all the pipes.

The vinegar has natural acidic properties that will decalcify the pipes.

What dissolves limescale in pipes?

Limescale in pipes can be dissolved with a mixture of equal parts vinegar and baking soda. Pour great quantities of this down every drain.

Wait about 10 minutes to allow the mixture to react and begin to dissolve the limescale. Next, pour boiling water down all the drains.

If you have particularly gnarly build up, you can always remove drain pipes and soak them in a combination of baking soda and vinegar.

What is the strongest calcium deposit remover?

When limescale and calcium buildup is extremely severe, you may consider muriatic acid. This is a very strong acid that is hydrochloric-based and it descales quite well.

However, it is an acid and it can be dangerous to humans and animals. You want to use this only as a last resort and it is best handled by a professional.

Does baking soda dissolve calcium deposits?

Baking soda by itself is not very effective against calcium deposits. But when an acid is introduced, such as vinegar or lemon juice, baking soda goes through a reaction that causes it to fizz.

This fizziness is what helps the solution eat through limescale and calcium deposits.

Will vinegar ruin a faucet?

While vinegar is a popular cleaning solution and it can be used inside pipes, you want to be careful when reaching for this liquid when it comes to your faucets. Vinegar is harmless on many types of bathroom fixtures, such as chrome, but it can be damaging to brushed finishes.