Can beneficial bacteria really improve pond water quality?

Short Answer:
Yes—but only when used with proper aeration and nutrient management.

Detailed Answer:
Beneficial bacteria help:
Break down organic waste (muck)
Compete with algae for nutrients
Improve water clarity over time

Limitations:
Do not remove phosphorus permanently
Require oxygen to function effectively
Work gradually, not instantly

Best results come from combining:
Aeration
Bacteria
Nutrient control