my buddy has a salt water swimming pool ,not chlorine ,but salt water so.. the funny thing is he brought me a jar (mason jar) full of somthing that happens to be living in the system......He figured I might know what it was because he knows I must have been a marine bioligist in another life so... what was it? well in my opinion it is copepods. I say that because his house and pool is a stones throw away from Bogue sound , a bird could have droped a rock,scallop,or anything from the sound into his pool. tomorrow I will take my refractometer over ther to see what the actual specific gravity is . His test kit only tells him if there is enough salt not what level it is(it might be higher than he needs)therfore able to sustain copes any other opinions? these guy are cope no question Ive seen lots and I know a cope when I see one