Thats a shame to hear that. I dont know about the 55 gallon problems as i have only bought a 5 gallon pail. And it also is partly empty as stated on there website. I added the water to the concentrate and have not had a problem. I dont endorse this company or anything like that, just very pleased with the product and the service.
When did the foaming start? After it went threw pump or as you was adding it to tank? Just curious.
Troy