Urea-based nitrogen sources "require" soil-borne microbes to break the urea down into useable nitrogen. Since hydroponics uses no "soil" it's best to use a nitrogen source other than urea-based.

That being said, compost tea will grow most stuff. There's another link on my Web site which will take you to a fellow that custom-fabricates hydroponic nutrients. He designed the nutrient I currently use to grow strawberries and tomatoes and even though composted chicken manure tea works great, the nutrient he made for me surpasses the tea by a factor of at least 5! Give it a look-see.

If you use compost tea for peppers, keep a close eye on your EC. The tea tends to be a little on the strong side unless you purposely cut it with water.

My tap water contains calcium and is very hard (EC 1.2 right out of the faucet) so I resorted to cutting my nutrient with R/O water to achieve optimum levels for lettuce and peppers.

I know that if one opened up where I live it wouldn't get enough business to stay open for long, so I have to order all my specialty gear online, or try to build it myself.