I couldn't find 71% alcohol. What did everyone else use?
70% isopropyl rubbing alcohol--Walgreens, Walmart, etc.
What are people using for the "saline solution" in Hydrosphere 4: Marine Ecosystems? It calls for 3.5% saline. Is this homemade solution as used before, a contact lense Solution or nasal wash? Any suggestions?
La Grande, OR
3.5% saline is equivalent to ocean water. Here is a good website with directions (you will use the 35 ppm recipe) https://manoa.hawaii.edu/exploringourfluidearth/physical/density-effects/density-temperature-and-salinity/practices-science-making-simulated-seawater