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Thanks mate... you mean daily* as a preventative? Or as a fix ? Thanks!

Hi, can i get a quick answer on how much hydrogen peroxide to put in my NFT tank as a flush? I can only get medical grade 3% stuff from the pharmacy. I have just put my first tank of feed in 200 Liters and in 24 hours i have foam & cloudy look to the reservoir... and the ph has gone up from 5.5...

No they havnt been cleaned. I don't know if manual calibration is possible ( i didnt get the manual) when i use buffer solution they automatically choose the level (incorrectly) Thanks

Hi, i have 3 different ph pens ( with no manual) all cheap.. 1 yellow/ another green one and a red EZ9908 4 in 1 (the best one) I have tried calibrating these and they all jump to a different number after holding the CAL button. ( i hopd one in buffer 4.0 and it calibrates to 6.86 automatically...