a funny story when i use to work at age a customer called in asking me about salinity and told me he taste tested his water and that is how he knew how salty it was compared to the last time he did a water change and tested i was beside myself, i proceeded to tell him that i suggested that he should invest in a hydrometer or refractometer so that he could make sure and be able to test more accurately than a taste test that he could no way determine the saltiness of his salt water he was mixing to do a water change very funny story and very true