Muriatic Acid vs. Dry Acid: Choosing the Right pH Adjuster for Your Pool

Which Is Better: Muriatic Acid or Dry Acid?

Muriatic acid and dry acid (such as sodium bisulfate) are both used to adjust the pH levels in pools, but they have some differences in their application and effects on plaster or gunite pools:

1. Effectiveness: Muriatic acid tends to be more effective at lowering pH compared to dry acid. This is because muriatic acid is a stronger acid, so it requires less volume to achieve the same pH adjustment.
2. Application: Muriatic acid is typically used in its liquid form and needs to be diluted before adding it to the pool. Dry acid, on the other hand, is added directly to the pool water in its granular form. This makes dry acid easier to handle and store.
3. Speed: Muriatic acid tends to lower pH more quickly than dry acid. If you need to rapidly lower the pH of your pool, muriatic acid may be more suitable.
4. Residue: Muriatic acid can leave behind a residue that may require additional cleaning. Dry acid, when dissolved completely, usually does not leave any residue.
5. Cost: Muriatic acid is generally less expensive than dry acid on a per-volume basis. However, since muriatic acid is more potent, you may end up using less of it over time compared to dry acid.
6. Safety: Both muriatic acid and dry acid should be handled with care, as they can be corrosive and harmful if not used properly. However, muriatic acid tends to produce more fumes, so adequate ventilation is important when using it.

When deciding between muriatic acid and dry acid for your plaster or gunite pool, consider factors such as the current pH level, how quickly you need to adjust the pH, ease of handling, and cost. It's also a good idea to consult with a pool professional to determine the best option for your specific pool maintenance needs.