1. i have a 5gal. DWC bubbler going right now. i always take a small cup and mix the water before i take a little ot for testing and return it when done. But why does my TDS meter always tell me more then a 100+ over where it should be on my fist check then the other 3 or 4 i do in a row are where the ppm. Should be at? 2. should u flush from vegg. To bloom nutes? and if so how long would be a good time to flush? should it be done while still in the vegg light cycle?