Be very careful with that stuff...most bottles labelled "pHup" that I've seen have NaOH...not something you want on orchids...These things are used for aquaria...you want something potassium based..(K20? KOH? i forget and I'm too lazy to check the label....)...I use ProTekt, which has added silica...don't no if the silica is worth anything, but its readily available, not expensiv, and I use it to adjust the pH for my paph fertlizer...Take care, Eric Muehlbauer in thundery Queens, NY...paph barbatum and Bifrenaria harrisonia(?) in bloom....
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