how to do ph test in pond water can you use elodea in an experiment when can the ph of a pond be measured how long does vinegar take to get ph back to normal after treatment how to compare two ph testing methods what is the statistical purpose of vinegar do you have to do a statistical test for elodea what's the purpose of vinegar how to determine the ph of an elodea tank? can you do a statistical test with elodea does elodea affect ph can you compare the ph of a pond can a study be performed to measure the ph of an experiment how long does it take for a elodea tank to reach normal ph when you add vinegar to a pond water tank what does ph change how long does it take for a pond to return to normal ph does elodea affect ph does adding vinegar change ph in ponds do you have to compare two tank sizes before a statistical test is performed? how long can a ph test be conducted