Flushing plants...good idea???

I agree with NobodysBuds.

I agree it sounds a bit weak in the mix to me. Id go for 500ppm with your nute mix then add the 150 pm cal mag, so your wanting more like 650 ppm. The cal mag is an additive most of the time and can be left out as most good nute mixes have trace elements in the mix anyways, so I dont actually count it when adding up my PPM. If I want to use 500 PPM nute mix, thats about 2 mls per liter for my nute brand. My cal mag says 1 ml per liter to maintain levels and 2 mls per liter for signs of defec. I also use humaboosta (humic/fluvic acid) Now to make up my mix id add 2 mls per liter of part A, and 2mls per liter of part B. Then test the mix. If its 500 PPM as wanted great. Use this mix as is and next time put the additives in if wanted, this mix was a test to make sure the bottle directions = what they should be. Then in future u know what u need to add without having to test it. Now the way to actually prep a mix, The proper order for mixing plant nutrients Step 1) Start With Silica if using it. Step 2) Add your base nutrients. Step 3) Add your cal-mag. Step 4) Add any other additives last. Step 5) Finishing by pHing your nutrient solution.

if you add a volume of water @ 150ppm,.... then add another volume with its own ppm of 550... neither will be the same once in teh substrate together. e.g. if 1L each, then you'd have half the ppm of each for a total of 350ppm (75 + 275). you should be able to add cal mag to a fully dissolved solution of your "550ppm" without causing a precipitate. unless it is a drastic change, i'd just irrigate as normal with this mix. skip the flush. Ah, i see you are in hydro, so simply changing the rez or bucket etc will effectivley transition to your new mix of nutes. easy-peasy. Okay, i see the damage in the diary. the pic attached to question above looks nice. Check roots for any slime or off-color not related to nutes. Pic 17 looks like nitrogen def. The other damage looks like potassium deficiency? try bumping up to a 700-750 ppm mix. double check your pH in any rez with issues and the roots, of course. easy to rule that stuff out, first. you calculate your ppms? do it for each molecules.. compare below: 130 / 50 / 200 NPK and 100+/80+/110 Ca/Mg/S - some of the secondary stuff will depend on tap water a bit, and should have your trace elements in any 1 part of your "hydro" nute lineup. consider these ballpark figures... adjustments from here as need based on observing plants. based on ppm you have fed, i have a hard time seeing a toxicity. it would have to be pH or ratio of nutes imbalance of large proportion.

No reason to in hydro. Just add new solution. Monitor ph closely and adjust. I hope you are using something to keep roots, and solution sterile.