I have a Ph of 7.5. I put water into 45 gallon barrels and adjust the PH with a PH down acid from a Hydroponic shop. Have done this for many years without any problems. Just make sure you have a good PH meter and adjust it slowly. It doesn’t take long to get into a routine and my collection is of a size that I water by hand with a can. I’m sure though that this system could be automated. There are some clever people out there and I would suggest a pool shop would have the correct electronics to achieve this. Don’t use swimming pool chemicals. Hydroponic shops are a great source of organic fertilisers such as fish emulsions. Propergators etc.
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