🧪 Muriatic Acid vs. Sodium Bisulfate: Which pH Decreaser Should You Use?

Not sure whether to use Muriatic Acid or Sodium Bisulfate (Dry Acid) to lower your pool or spa’s pH and alkalinity? Both are effective — but each has specific advantages and considerations.

⚗️ Muriatic Acid (Liquid)

Muriatic acid is a highly effective and cost-efficient way to reduce both pH and alkalinity, especially in saltwater pools.

Pros:

• Fast and powerful pH and alkalinity reduction

• Lower cost per treatment

• Ideal for saltwater pool systems

• Now available with vapor reduction technology (90% fewer harmful fumes)

Cons:

• More hazardous to handle (strong fumes and risk of spills)

• Should NOT be used in spas or hot tubs

• Requires careful handling and protective gear

⚠️ Recommended for pool use only — especially with salt chlorine generators.

🧴 Sodium Bisulfate (Dry Acid / pH Decreaser)

Sodium bisulfate is a safer alternative to liquid acid and is approved for use in both pools and spas.

Pros:

• Non-toxic and biodegradable

• Easier to store and handle (granular form)

• Less risk of splashing or fume exposure

• Safe for use in hot tubs and spas

Cons:

• Slightly more expensive per use

• Can take a bit longer to fully dissolve in colder water

⚠️ Safety Guidelines for Both

Regardless of the chemical you choose, proper safety measures are essential:

• Always wear acid-resistant gloves, long sleeves, and safety goggles

• Avoid inhaling fumes and prevent skin/eye contact

• Store chemicals in a cool, dry area away from pets and children

• Always add acid to water, never the reverse

🧼 Which Should You Choose?

• Use Muriatic Acid if you have a saltwater pool and want a cost-effective, fast-acting solution (pool use only).

• Use Sodium Bisulfate if you're treating a spa, want safer handling, or prefer the convenience of a dry product.

💡 Still not sure? Bring a water sample to Premier Pool & Spa or contact us — our experts can help you choose the best option for your system!