my well water has a ppm of 30-50, you should get your water tested too see why it is so high. it could be loaded with a mineral that can lockout your nutes. RO systems aren't to expensive will be worth it at the end
looks like a water bug they like damp and moist places like your water supply or hose, http://www.cals.ncsu.edu/course/ent525/water/aquatic/pages/09_jpg.htm