This is a great product. I try to drink zero or low calorie drinks, but I hate artificial sweeteners, stevia and sucralose etc., and I find plain water does not encourage me to drink enough. The True Citrus basic Lime, Lemon and Grapefruit sachets are excellent and do not contain any sweeteners - just some powdered oil and juice from the fruit, with citric acid, which helps protect against kidney stones. They make it easy to drink plenty of zero calorie water. They are also good in hot tea. Be aware of the acidity side of things for your teeth, but for me overall the health benefits from encouraging hydration and helping keep a healthy weight more than outweigh this.Note that I believe the basic orange sachets contain a little sugar, and some of their more processed drinks e.g. their lemonade range contain stevia (ugh). My positive review is for the "basic" lime sachets, lemon sachets and grapefruit sachets only.The sachets contain a powder which you mix into your drinks etc. Unfortunately, you will occasionally receive orders where the powder has spoiled and solidified into something resembling small pieces of plastic. Probably caused by improper storage or conditions during delivery. Check your order when it arrives - the sachets should all contain a powder which dissolves in cold water. They should not contain solid lumps. I recently received a 500 box of lime where all the sachets had solidifed in this way. The regular Amazon returns system would not let me return the box as it was a food product - I used the chatbot service and it refunded me. Looking at the reviews, others have experienced this problem too - I expect the manufacturer is well aware of it. I'm concerned what will happen the next time I receive a spoiled box, as presumably the chatbot system would flag repeated refunds. I'll still keep ordering, as it is an excellent product, but I might stick with the 100 sachet boxes rather than the 500 packs, to balance the risk.