[GpsFrontier]

How is your pH changing? By how much, and how fast? I would be interested in your conclusions about using phosphoric acid, verses the citrus acid. I have been using a citrus acid pH adjuster for years, and it works great for me (I have never used anything else). As for the bubbles not popping, do you have any pictures? It sounds like you are saying they are forming bubbles on top of the water like a bubble bath. If that's the case, you may have something growing in it like algae, bacteria, or fungi (or didn't rinse all the soap out after cleaning). Algae, bacteria, and/or fungi would also be a likely cause of pH issues.