Hi Bill,

Thank you for your response.

I have enjoyed reading the linked articles below and am currently looking for info about the potential silicate content in the perched groundwater here (SE Ohio).

Any input, including clues for investigation, will be appreciated.

Best Wishes,

2009 Test Report for Lake Vilbig: Achnanthidium minutissimum

2007: Diatoms from the genus Achnanthidium ...