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I've ONLY used coco for my hydro.
I've used distilled vinegar to adjust ph since I started gardening as a little boy. I've never had a problem with it. Baking Soda will raise the PH, but I would not use it long term. I believe the plant treats it as salt, so after a while the buildup should lock out nutrients. Might be problems using vinegar long term as well, but both are great temporary fixes until you can get something better. (I've also used lemon in an emergency, run it through a coffee filter. =)
Also, my Hydroponics guy recommends 5.8 PH for Canna Coco. This may be different for different brands. Canna is a superior coco that has different properties than your average coco.
I do know that with coco, high PH is a BIG NO-NO. You can go much further down than you can up. So if you're unsure, go lower rather than higher. Hope this helps a little.
Hi Ziminy, thanks for the advice. Thankfully the Sulphur seems to be working slowly. Ph down to approx 6.4 so slowly improving. Distilled vinegar is a good one i'll have to remember.
Am using Nutrifield coco, no idea what the specifics are for it.