Mould and Yeast
At the time of a DNA Multiscan of untreated water a Mould and Yeast test be should done on a plate . This will give you a good visual of the kind of moulds that are growing and can be quantified.
Agrozone recommends doing mould and yeast plating on a weekly basis to make sure that pathogens are being kept under control by the disinfecting method.
Yeast are not important for most greenhouse water supplies but gives a good indication of cleanliness of the water.
With some training most growers can do this themselves or you can send the samples to a Lab.
Agrozone has been working with AWLS for on farm water collection and plating for quick results.