Magnesium Hydroxide

Safe pH Adjustment for Anaerobic Digesters

  • Stabilizes anaerobic digesters
  • Will not raise pH above 8.0
  • Fast and easy to use


Stabilize your anaerobic digester quickly and easily when taking in acid waste streams. Reach for this product when your anaerobic digester has gone sour and neutralized the pH.

Compared to caustic soda, magnesium hydroxide is very safe and will not raise the pH above 8.0. When you apply magnesium hydroxide, make it into a slurry for better overall results in your anaerobic system.

Dose Rate

Approximate Dosing for pH Below 6.0

Digester Volume (Liters) Initial Dose (Once per day for 7-14 days, or until pH reaches 6.0)
378, 541 L 45 Kg
1.89 MgL 227 Kg
3.78 MgL 454 Kg

Product Pairings

Complete your pH adjustment plan and improve the pH stability with Boost N Lock.

Applications and Benefits

  • Great for neutralizing acid waste stream
  • Works better in digester with good mixing
  • Recovery if an anaerobic system goes sour
  • Safe to handle and safer for your system

Exact Dosing Bench Test

Running this simple titration test is the best way to accurately know how much to add.

  1. Prepare Chemicals: Make a slurry mixture of 50g of magnesium hydroxide and 1000 mL of distilled water. Add the slurry to a bottle with a cover so it can be shaken up regularly.
  2. Prepare Sample to Be Tested: Collect 500 mL of well-mixed (if possible) anaerobic digester sample in a 1000 mL beaker. Place the beaker on a mixing plate with a magnetic stir or put in a 1000 mL beaker with mixing.
  3. Add Magnesium Hydroxide Until Desired pH is Achieved: Test and record the initial pH, then add 5 mL portions of magnesium hydroxide. After each 5 mL magnesium hydroxide addition, mix the digester sample for 3 minutes and then test and record the pH and add another 5 mL until the pH is at 7. Magnesium hydroxide should be shaken or mixed before each 5 mL addition.
  4. Calculate Dose Required for Full Scale Treatment: Once the pH reaches 7, the dose of 5 mL equates to 210# of magnesium hydroxide per 100,000 gallons digester volume. This means you will need to add 210 pounds of Boost N Lock per 100,000 gallons digester volume or other solid pH adjuster for each 5 mL added to the beaker.

Product Resources

PDF Downloads: Product info, SDS, and white papers

Magnesium Hydroxide Product Sheet
Magnesium Hydroxide SDS


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