The Food Safety Dish13 Jun 2023

Diving Into Ponics Systems with Sean Fogarty

Have you pondered ponics systems? Sean Fogarty is a Research Specialist at the Northeast Center to Advance Food Safety focused on-farm produce safety in the Northeast, and hydroponic and aquaponic food safety nationwide. We talked all about aquaponics & hydroponics, risks to consider, and how interested growers can venture into ponics operations of their own.

Some post-show notes from Sean:

When recirculating a nutrient solution, water treatment of some form will be required to maintain optimal water quality (chemically, physically, and biologically). At the most basic this includes physical filtration to remove particulates from the recirculating flow.
Accumulation of organic matter (OM) in the nutrient solution is something to avoid, whereas in soil-based farming you want to increase OM. There are a few ways to measure the OM accumulation, the simplest of which is turbidity. People also use ORP (oxygen reduction potential) as an indicator of nutrient solution quality.
Even for exempt farms and produce, it is a good idea to prevent contact between the recirculating water and the edible portions of the produce. This reduces the chance of a single contamination event spreading to the rest of the system.

Resources:

Factsheets - Produce Safety in Hydroponic and Aquaponic Operations https://go.uvm.edu/ponics
Hydroponic Good Agricultural Practices (GAPs) Course - Ohio State University ($150 fee)
- Qualifies as “GAPs training” for USDA GAP/GHP Audit or as “Worker Education and Training” for GAPs Harmonized Food Safety Standard USDA Checklist and Harmonized GAP+ Audit
CEA Food Safety Coalition
- Industry group that developed supplemental guidance for CEA operations undergoing or preparing for Global Food Safety Initiative or equivalent audits
- CEA Food Safety Certified label and certification information

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