Three months ago I ask a question about a renewal battery product from batteries.com. Most stated to use distilled water only. With my solar panel not keeping my two 27 batteries not holding a charge, I said what the? I used the liquid product per info, charged both up to max, and waited. Checked both two wks later, they were charged up, but upon inspection, I found all cells had what looked like pieces of straw floating on top of liquid. Called the mfg, and was told it had cleaned as indicated. I have used them for three months, and my solar panel now keeps them full charged. It worked on my problem, and kept me from buying two new batteries.