Some call it hydrochloric acid. Others, a weaker version of HCL.
Muriatic acid is a common cleaning agent in many homes. Its diluted version is often added to commercial cleaners. The acid can also be used independently to descale and disinfect surfaces.
As far as its safety for septic systems goes, steer clear of this one.
It has the ability to not only corrode your pipes but kill bacteria in your septic tank as well.
But you can use it with special caution. Find out below.
What is muriatic acid?
Muriatic acid is a form of hydrochloric acid (HCL ) or spirits of salt.
It is manufactured by dissolving hydrogen chloride crystals in water.
The resulting liquid is colorless and has a sharp pungent smell.
Muriatic acid is a strong mineral and very corrosive. HCL and muriatic acid are similar in many ways except the former is purer and more toxic than the latter.
The pH of HCL ranges between 1.5 and 3.5 while that of muriatic acid is about 1-2.
Besides purity and pH differences, muriatic acid also contains some impurities such as iron.
As such it has a yellowish color in contrast to HCL’s colorless color.
Is It Safe For Septic Systems?
At home, muriatic acid is used to remove stains and mold from swimming pool surfaces and basements, get rid of rust from stainless steel, clean stained showers and sinks, and clear clogged shower drains.
It can remove the toughest of stains that other cleaning products cannot.
Unfortunately, it is not the safest thing for your septic tank.
It is a reactive liquid and one that is considered hazardous.
For one, it is quite corrosive. A higher concentration can damage specific types of plastics. It can also hurt your skin and corrode clothing, metal, and other surfaces.
Whether you have a plastic or metal network in your septic system, the acid can cause damage to them.
Muriatic acid is also a bacteria killer like its stronger counterpart hydrochloric acid.
Count on it to affect your bacteria colony. It may not kill all the bacteria in the tank but it will wipe out a substantial amount.
But…
While muriatic acid can affect septic systems, it can be used under certain circumstances.
First and foremost, a very dilute solution can be utilized as it poses less risk to septic tank bacteria.
Before using the acid, consider diluting it even further.
Use about five parts of water and one part of muriatic acid for the best results.
Use gloves and other protective equipment as the gas has strong fumes. If possible, carry out the mixing outside or in a well-ventilated area.
If the acid comes in contact with bleach, it will release chlorine gas which is very toxic.
Besides diluting muriatic acid, you need to use it occasionally rather than as an everyday cleaner.
Frequent use will cause damage over time, no matter its concentration.
Only use it when you have to. Utilize other septic-safe ingredients on other days.
The Bottom Line
Muriatic acid can dissolve some of the toughest stains at home.
Granted, it is extremely toxic to septic tanks but using a low concentration from time to time will keep your system in top shape.
Read every label, dilute with water, and use the acid sparingly.
Don’t forget to protect your skin when using the acid at all times.