As soon as the TDS goes above 000 i change it , it makes no sense to me to carry on , if your TDS goes above 000 half way through your day and you carry on , not only will you end up putting it right for nothing , it will also be 1 strike against you in certain customers eyes , you know how they can be , and all for the sake of a few pence , is it worth the risk ?
Rich P @ F