A: That's interesting that the problem only started after you began using a new product. More often than not, the foamy spa water is caused by an excess of contaminants in the water, a pH/alkalinity issue, and/or soft water with a calcium hardness level that's too low. Assuming that your spa has been regularly drained and refilled on a 3-4 month schedule, your plumbing is clean and free of biofilm, and all aspects of water chemistry are in balance, the next step would be to try adding an anti-foam product to the water as part of your regular maintenance routine. We would recommend using either Rendezvous Foam Out or Leisure Time Foam Down. Here's a helpful article that walks you through how to fix the root of the foaming problem: hottubworks.com/blog/foam-in-hot-tubs.html