Are you struggling with cloudy or murky water in your pond? Suspended clay particles and algae can make your water look dull and unhealthy. Aluminum Sulfate (Alum) is a a drinking water-certified (NSF/ANSI 60) solution designed to clear contaminants and restore crystal-clear clarity to your pond, lake, or even your swimming pool.
Why choose Aluminum Sulfate?
- Effective Particle Clearing: It binds to suspended clay and algae, causing them to settle at the bottom of the water column within hours.
- Phosphorus Binding: Helps reduce harmful algae blooms (HABs) by binding sediment phosphates.
- Versatile Use: Ideal for large lakes, farm ponds, and even residential pools or hot tubs.
- Professional Grade: Our granular alum is a naturally occurring chemical refined for maximum efficiency.
Application Tips:
We recommend completing a test before treating the entire pond. Obtain a Aluminum Sulfate Sample from us, collect two jars of water from your pond. In one jar add a pinch of alum and leave the other jar as a control. Wait 24-48 hours. If the particles settle, then alum is what you need.

For most ponds, we recommend a rate of 25 to 50 pounds per acre-foot. Because alum is acidic, we suggest monitoring your pH and alkalinity levels (aiming for 7.0+ pH and 75+ mg/l alkalinity) to ensure a safe environment for your fish. When applying alum to your pond or body of water treat only half the water at once, allowing a few days between the treatments.
Ready to see the difference?
You can order our 20 lb. or 50 lb. bags directly through the links below. We even offer a sample size if you'd like to test the results first!

