Also, i used to monitor daily my ph/ppm's going in and out. I've stopped doing this recently because i have a much larger collection pan which gets dirty fast with several days of feed, but i do have the option to stick a cup under my drain area and collect a small sample after each watering. I did this recently for two days and my feed going in was below 400 but the runoff was over 750. When this occurs, should i flush for a few days until the numbers match more closely? In the past i would feed around 350-400ppm and get back 200-250ppm which made me feel more comfortable, but still not convinced that i was nailing the plants' dietary needs. Any suggestions on testing runoff for ppm's?