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That is a very good thought, our tap water here has a shift every 6 months, you can smell it. (Delta water) Didn't think of it using RO.
I would start letting tap sit for 24hrs then check ph on straight tap. Sometimes water companies have to add more chemicals to make water safer. So it will constantly change. But my tap comes out about the same and after 24hrs it is about 7.5 and 200ppm, 48hrs and tap is about 7.2 and 150ppm.
Flushed her today with pH 5.8, 170ppm tap water.run-off ppm are much to high, shouldn't be more than 250ppm higher than inputs,... Andlower that ppm input a lot, like 700ppm, not including the water... that's too hard for coco mate, no way around that, too much CaCO3 going in, forcing pH up,... coco needs to run 5.8-6.2-ish,....
... a bit on the cool side in general,slows uptake and transport down,....
... BUT first, you need to get that current nute salt build-up removed! In coco, it has to be done differently than soil... recommendations I see are with RO/Di?very low ppm water, with 150ppm Ca-Mg, plus another 150ppm of base nutes, pH to 6.0, and poured through until at or near input values,... right now the pH is off, the load of nutes in there is screwing with that and the CEC,.. the excess has to get removed!
This is coco growing mate, it's not easier than soil by any measure,... you may get away with improper methods on occasion, but sooner or later it'll catch up to you,...
Flushed her today with pH 5.8, 170ppm tap water.
:smoking: How's it going Troop'? ...what was the run-off pH and ppm's?
.... do you have any of those self-fill water machines around, or a water store? that's the less $$ way to get very low ppm water, unless you want to invest in an RO system, which usually aren't too bad for price,... a small unit, 3-stage is fine, 25-50 gallons per day can be had for about $60-$150 in USA (if you're stateside?)... Hydrologic makes excellent units!
Let me call in my coco-Guru @arty zan .... I'd say the feeds are too strong still, especially for a troubled plant.... more conc. will not make her take up more,... I think he runs from about 1.0 EC (1.0 EC = 500ppm) for seedlings, up to 1.7EC in prime bloom, tapering off some in late bloom (nute consumption naturally slows down that last week or so,)... I still think the CEC is screwed up, giving you all these wild swings and variations... He also recommends that the harder the water, the more run-off you have to get, hence the wisdom of RO! You can blend the tap water in some too if you like,... BTW, did you flush with the solution recommended above? It's made that way to not only remove excess, but to help restore the CEC again,.. straight water may make matters worse!
Coco is a bitch when it goes wacko like this my friend, I feel you frustration! It's one reason why I don't bother,... coco is great-- after you master it! Arty run's a drip system I believe, grow monsters in small pots, but that under a very "hydro-like" system...... Good soil is so much more simple and forgiving, and I highly recommend that you try soil next round... Are you in the States? If so, I can offer a few good choices for soil,... You may even consider one of the "water-only" soils, like SoHum or KIS offers,... Though they still recommend that to get the very best out of it, some additional goodies go in (all good for coco too BTW),... Si, humic-fulvic, inoculants, kelp/micronute supp's, even some PK boosting during bloom to really fatten them up...
I saw the fantastic Fruit auto you grew today!:drool: I can see why you wanted to keep the same gig going,... alas, now you see why I cautioned you about coco's lack of flexibility and bitchiness!