What is the measure of water clarity in pools referred to?

The measure of water clarity in pools is commonly referred to in terms of NTUs, or Nephelometric Turbidity Units. NTUs indicate the degree to which light is scattered by particles suspended in the water, which is a direct reflection of the water clarity. This measurement is essential in pool management as it helps determine whether the water is safe and clean for swimming. The lower the NTU reading, the clearer the water, and ideally, pool water should have an NTU value that falls within safe and aesthetically pleasing parameters.

Additional terms like Clarity Index, Visible Light Transmittance, and Transparency Rating may relate to water clarity in different contexts or be used in different industries, but in the context of swimming pools and specifically measuring turbidity resulting from suspended particles, NTUs is the standard and widely accepted measure.