References and Links
- How Ultrasonics Work
- Algae Images Ohio University
- Center for Biofilm Engineering
- US EPA Office of Water
- US Geological Survey
- National Environmental Services Center
- American Water Works Association (AWWA)
- Water Environment Federation (WEFTEC)
- National Rural Water Association
- WateReuse Association
- Aquatic Plant Management Society (APMS)
- North American Lake Management Society (NALMS)
- Onsite Water Treatment
- C&E News
- Online Solar Inc.