I think most nutes /sup. lower ph .My tap water will raise it and increase over a day or so(I start w/distilled). Very little ... start with a gal of distilled and add 2 ounces of tap may be enough to raise ph .If you have a phmeter or indicater , try experimenting with using nutes as the "adjuster" , Example . From seed I use drops of GH nutes per gal of distilled . I use like 5-10 drops to start and can go all the way to about 45 drops without checking or worrying about ph. Some nutes/additives (like hygrozyme) can change ph slowly over a day or so you may want to figure these out by testing ph a couple of times or so untill your familiar.
You will get to a point where youll say added a dose of hygrozyme to your base and you will know 2 drops of up will level it . this is not true w/my tap ,,again it is unstable. Distilled stays very stable for me .