I have one cat who has UTI troubles, and 5 other cats who don't. They get wet in addition to their dry. Right now they are on California Natural dry, which has .12% magnesium. Someone on here told me to keep the magnesium in dry to .09% or lower. Are there any good quality dry foods that have lower magnesium. I would love to switch them to an all wet diet, but I have a few who refuse, so I need a good food that will work for everyone, in case the UTI kitty gets into it.