The following resources are helpful for further information on a range of topics related to the state of the river and to performing water quality testing:

• Cardiff University’s guide to phosphorous for citizen scientists (helpful guide including basic explainer, different test kit, the targets set for rivers - provided with support from the EA and NRW).
• The Freshwater Habitat Trust’s explanation of how to interpret phosphate and nitrate results.
• Cardiff University’s assessment of results taken by citizen scientist’s handheld Hanna Phosphate checkers against lab-based results over the course of a year, showing remarkable consistency.