A good muriatic acid storage container is a plastic or plastic-lined container. Metal buckets are more prone to be attacked by acids than most plastics anyway.
You should store Muriatic outside. It has a long shelf life irrespective of temperature, does not freeze, and can be left outside in the winter.
Never keep it close to metals as the fumes from sealed containers can rust metals around it. Since muriatic acid caps are vented, gas can escape from them even when unopened and lead to issues and rusting.
You should keep the number of times acid is poured from container to container to a minimum.
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How to Store Muriatic Acid
To store muriatic acid, get a 5-gallon bucket with a lid. We have recommended a decent one below. It has a lid with a decent rubber seal. Once inside, you can leave it outside away from metals. However, I buried mine behind my shed and buried it halfway in the ground for stability.
I put the gallon container of MA in the bucket and put the lid on the bucket.
How Should Muriatic Acid be Stored?
Muriatic acid (37% HCI) is typically stored in plastic or plastic-lined containers (in homes or industrial quantities) or at times in laboratory supply.
However, the plastic has to be compatible with HCI. So, PVC and polyethylene are acceptable materials (HDPE is better, not LDPE). PTFE (Teflon), ABS, Most epoxies (also fiberglass), and a number of engineering plastics and elastomers such as PVDF, FKM, PEEK, and Viton are also great choices.
Any amide, ester, acetal, or amine linkage will slowly hydrolyze when exposed to muriatic acid. NEVER use water bottles, or poly carbohydrates such as Kevlar, nylon, Lexan, Polyurethanes, and Delrin.
READ MORE: How to Clear Algaecide in Pools, Fish Tanks or Ponds
How Long can Muriatic Acid be stored?
Under the right conditions, Muriatic acid can be stored for years.
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