Greenmopho
Member
when i first started my hydro project, it was with my cloner. as per someones advice on here, it said that the best way to use the pH down is to add the nutes first and then add the pH down as necessary to get it to the proper pH. and you have to remember i was starting at a pH of 8+!!!
doing that, and then testing the water after "x" amount of days, had me looking at 8.0 again as though i had never added the pH down to begin with.
since that debacle ive had a bucket of water and a rez standing by that i have been testing for a week straight and both of them have tested at exactly 6 - 6.5 every time. even my cloner had tested to 6 - 6.5 for about a week, and thats after i changed the water out, from the first time thinking that the first batch was bad.
what it seems to be is the water, once the nutes are absorbed by teh plants, reverts right back to teh original pH it was before nutes were added. so my problem/mistake started (the first time) because i added the nutes first which brought the pH to 6 -6.5 and THEN i added the pH down to get the water to about 5.5 - 6 which is where i would have wanted it it to stay once the nutes were absorbed. what happend was (the first time with the cloner that had me freaking out) the plants absorbed the nutes which caused the pH to raise again BUT with not enough pH down in it to begin with to properly get the water to a maintained level, it would have seemed as though i never did anything to my water to level the pH at all!!
eureka!! ive found what i did wrong and what i need to do for the future. . . instead of adding the pH down last or after the nutes , i am gonna add the pH down FIRST so that the water is at a stable level to begin with, SO THAT when the plants absorb the nutes it will go back to that stable level.
SOOOOO once i pH my water to say 6 - 6.5 then add my nutes , the nutes should bring it lower a couple points , so i go from 6 -6.5 to 5 -5.5(6), once the plants absorb the nutes from the water they would stop showing new growth and then i will know to add more nutes OR when the plants seemed to have stopped growing for lack of nutes, when i test my water it should be back to the 6 - 6.5 range!!! yes that seems to be it!!
Sorry dude, you need to take a chemistry class, that's not how it works. There is no "going back" to the original pH, unless you are using tap water with pH buffers and all that crap in it, but you don't want to be giving that to your plants, regardless of the pH.
First read:
http://en.wikipedia.org/wiki/PH
Then:
http://en.wikipedia.org/wiki/Nitrate
Nitrate (in your nutes) and other "-ates", Phosphate, etc, are ionic salts that will bond and interact with positive hydrogen atoms, and effectively change your pH. By adding pH up and and down, you are just increasing or re-bonding these hydrogen ions to your salts. Your plants will uptake the salts from the solution, but they usually will absorb liquid at almost the same rate, unless in heavy bloom. A healthy system will usually maintain salt levels (sometimes fluctuate, depending on evaporation), and your pH should tend to drift slowly to neutral, 7.0. If you are on tap water, you have a ton of other salts, metals, and other things present that will bond and interact with everything else you put in your water, nutes, pH correctors, ect. Its all chemistry. Lowering your pH first then putting your nutes will not make a difference, except lower your pH even further when you add your nutes, then you'll need pH up to correct it, again, and by then you've neutralized 1/4 of your nutes, and pushed your salts up needlessly. Nutes will lower the pH on their own, but not usually enough if your water coming in is above 7.2-7.3, which is why you add the pH down AFTER mixing your nutes, let the nutes do the initial pH correction, and then depending on your water, you have to fix the rest.
I would:
1. Use good clean water, filtered, store-bought, whatever.
2. Use some kind of hydro water conditioner, i.e. AquaShield, Hygrozyme, HydroGuard, ect., they have helped me tremendously with stabilizing pH and keeping pathogens at bay!
3. After mixing your nutes and correcting pH, you MUST check on it 24 hours later, after things have stabilized. 90% of the time, you will have to lower the pH again a bit.
Start off around 5.5-5.7 and let it drift up until about 6.1-6.3 before you correct it. You should also know to add very little pH down at a time, its powerful stuff, stronger than the pH up. And pH is a logarithmic scale, so it takes more pH down to go from 6.5 to 6.0 then it does to go from 6.0 to 5.5. If you tap water coming out is around the 8's, you usually will live in a western state where they dissolve chlorinated salts into the water, which is really not good for you or your plants, read up on it! The shit they put in Colorado and California water is disgusting, not to mention factory run off, pharmaceuticals, gasoline additives, FLOURIDE!
Thats about the best advice I can give right now!