How to Clean Filter Elements Using Muriatic Acid

By design, filters strain out impurities such as minerals, dirt and debris. Over time, filters--such as those in a hot tub or spa--can become encrusted with calcium, iron and even algae. When this happens, equipment performance can be compromised. There are several ways to clean filters; however, muriatic acid is one of the most effective ways to remove corrosive or thick buildups. While it is important to take proper precautions when working with this harsh chemical, it is a very easy cleaning procedure.

Things You'll Need

• Muriatic acid Water Mild detergent Warm water Stiff bristled brush/old toothbrush Bucket Rubber gloves Eye protection Hose with spray nozzle

Instructions

1. Remove filter components from their housing.

2. Mix a few drops of mild cleaning detergent with warm water. Wash filter parts in cleaning solution to remove all oils. Use a stiff bristled brush or toothbrush to get into tight cracks and crevices.

3. Rinse all parts with a hose and spray nozzle to remove as much buildup and debris as possible.

4. Create a solution of 1 part muriatic acid to 20 parts warm water.

5. Soak filter parts in the muriatic acid and water solution. Leave parts in solution until they have stopped bubbling.

6. Carefully remove filter parts and thoroughly rinse with water using a hose and spray nozzle.

7. Allow parts to dry, then replace in their original location.

Tips & Warnings

• Always wear rubber gloves and eye protection when working with muriatic acid, as it is highly toxic and can cause severe skin irritation. Take great care to remove all oils from the filter. Soaking in muriatic acid with oil still remaining could cause serious damage or completely destroy the filter, rendering it unusable.