A weekly webinar from ZP answering technical questions that have come in. There is no need to watch live as the webinar is recorded. Question 1A - Is it possible for you to make SPEs for arsenic detection? Question 1B - Do you have any information on the life expectancy of your SPE options? Question 1C - How many times can it be used before the electrode requires to be polished and how many times can we repeat this process? Question 1D - . How much can the chloride layer last on the reference electrode? Question Five - Is the shipping option of 200 the only one available to the US?