Hi, can someone give me a quick answer on whether or not the Seachem Test Kits are reliable for freshwater? I need a phosphate test kit and the Seachem is quite a bit cheaper than the LaMotte. I can order one from my local store if I put in a request by tomorrow but I'd rather spring for the LaMotte than get a test kit that isn't accuarate. How about the iron test kit? Olga in Vancouver