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pH Changes - Hard to Control

Amen NAKED, It's sure a big waste of our water supply.
Why not just get a big 55gallon drum, and catch rain water ,an save your money.
 
My RO water comes in at 7.0 always but I buy it by the gallon it I could see how an in home system might fluctuate . I have stopped using RO water on my bigger plants and only use it now for my seedlings . My tap water comes in at 110ppm after sitting over now night so I only use RO water for seedling to keep the Ppm low at the start . After the first few weeks the minor Ppms in the tap water don’t really effect anything . IMHO
 
I think I solved for my inability to control the pH. I've done 2 other grows (one coco; the other supersoil) and, now DWC. I tried tap water, then RO. Only when I switched nutes from Fox Farm (hydro) to GH am I able to control the pH.

Now: using tap water, GH nutes (according to Nebula's feeding schedule), checking water 2x daily (no adjustments needed last couple of days) for pH and ppm.

Moments ago, I topped-off the reservoir with the same. pH 6.3, ppm 534. Most importantly, pH is STABLE!!! Finally! F*CK!

DankwingDuck what should my ppm be at 3-4 weeks? I've read countless versions. What do you add to RO at the seedling stage? My RO water is bottled, from WallyWorld @ 89 cents/gal. Always 7.0. The roots are nice and white - not able to upload photos now, not sure why (not this site). There isn't much in the reservoir - very clean but, a bit cloudy. No sediment on the bottom. The roots look really good.

D.A.A.S.69 Ain't no rain in this part of the country for the time being. I'd love to use rainwater!

NAKEDGARDENER I love this GH waterfarm set-up with the drip ring. Works like a champ, despite not being terribly valuable well into the grow. There's no disadvantage, I can see, in using it throughout the grow - especially if you don't have much opportunity to water her throughout the day. I bought mine in a kit, from Amazon, for about $50 - all inclusive. I have zero motivation to build my own although do appreciate and respect that others do. It's a preference thing.

Thank you ALL so much for your encouraging words and helpful advice! I'm looking forward to a better grow and result with this grow. I get a lot out of the variety of advice I get through here and, whether I follow some, any or all of it, it's all valuable to me as it's helped me troubleshoot my problem. Thank you again!
 
OU812 thats awesome my friend well done... yes I am glad you are using the top feed system, it’s something many have recommended to me in the past and am going to use it for sure, please feel freel to let me know your results via a private message anytime. Good luck
 
As far as nutrients for the seedling stage I would use even parts of the base nutrient and then use everything else according to the bottle recommendation and then Use clean water to dilute the nutrient solution to the desired ppm when first planting the seedling into the DWC use clean water to dilute the nutrient solution to the desired ppm when first planting the seedling into the DWC Start your PPM’s at 50 and slowly work up to 200 when your plant grows to its first five finger node raisethe PPM‘s to 300 and slowly increasing the PPM‘s till 550 ,550 is going to be your max veg ppm’s
 
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DankwingDuck she's about 15" now. Thanks for the ppm info, Brother! That's what I needed! Today, pH 6.5, 545ppm, temp 79, rH 61%. Still can't figure out why I can't post pics - it's not a GWE thang - more like my Google Pics not receiving what Ima sending to it. I'll get that fixed this weekend sometime and post up some pics. Thanks, again, for all your help! I really appreciate it!
 
NAKEDGARDENER I like the drip feed and maintain throughout the grow. It doesn't hurt anything. When I shopped around for a DWC kit, I chose GH Waterfarm because I've used it before (20 years ago). The drip feed didn't cost any more than any of the other set-ups I looked at. In fact, it was a few bucks less. I'm going to do a couple of grows with this set up and hopefully perfect my skills (or, get as close as I can). Maybe three grows. Then, I'm going to try coco for a couple, using the same pH control/nutes (for coco - not Fox Farm). Then I'll try a couple with super soil. Very interested to see, when the same "developed skills" are applied to each medium, what my results are and, specifically, what is the difference in the results. Tweaking as I go, to find the perfect set-up for me and my girls.

If you do go with GH's Waterfarm, I'd suggest buying an air pump with 2 outlets - one to the drip and the other to an airstone in the reservoir. The more air to the roots the better, from what I've read and am beginning to experience now. I found a cheapy double outlet air pump at Wallyworld for about $10. Works great and is very quiet.

Thanks for your help, Brother! BTW, I like your setup in the pic!
 
Absolutely I intend to have at least two air stones per res, bro, only two 10 gallon reservoirs I think, was also thinking of mcgyvering some kind of res drainage system and refill via pumps and taps on the bottom of the reservoirs. I’m really glad things are working out for you brother and happy to be of some help, I hope to follow your continuing
progress.
 
Here's a pic from yesterday..
 

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