Hi One of my cats has recently been diagnosed with fairly advanced chronic renal insufficiency following a bout of ill health (including seizures). He's doing really well so far but he due at the vets tomorrow for a check up and I want to discuss one or 2 things with the vet but would like to swot up on it all first. I am an avid reader of Tanya's crf site but sometimes you read so much you just don't know what is the best course. Jaffa is almost 17 years old and his renal insufficiency has been diagnosed as IRIS stage 3 but he has very high phosphorus levels so has been given a phosphorus binder. The one he has been given is mucogel which I think is an aluminium based binder? It's a white liquid and I syringe it into his mouth 3 times a day with food. That's been going ok so far but he's starting to put up a fight (a sure sign that he's feeling better!) so I'm not sure how much longer I can continue to administer it in this way. I dont' think it tastes good so adding it to food is probably not going to work. Anyway, looking on Tanya's crf site I notice there are 3 types of phosphorus binder - aluminium based, calcium based and other (?) which includes Renalzin). What I need to know is what are the criteria for choosing one of these over the other? Or does it just come down to what vets tend to prescribe? Are certain types more effective than others? I can't remember his phosphorus level off hand (am at work) but it was over 3 (about 3.4 I think) so very high. Within each type are there different types? I know that Renalzin is a paste and is, supposedly, flavourless meaning you can add it to food. But if that didn't work getting a paste down him any other way would prove difficult. Also, do you have to stick to one type of binder? Or can you mix and match, so to speak? eg mucogel with his breakfast, Renalzin with supper etc. He is also on benazepril (Nelio) and may need to have something for high blood pressure if the benazapril doesn't bring it down enough. I have every confidence in my vets but one of the downsides of the practice I use is that it is primarily a referral practice with the general practice being carried out by postgraduate students. All qualified vets but without a lot of experience and sometimes there's no substitute for experience. So I like to do my research and ask lots of questions.