I have tried juice fasting to eliminate chronic pains, to lose weight. It works well for me.
Juicing is a good way to detox, but keep in mind it's expensive and messy. And you have to dedicate alot of time, you need aleast 6 juices a day and for the full benifit it should always be made and used right away or you start to lose some of the nutritional value. But if your up for the challenge it does help in detoxing your system so good luck! :)
Personally, I wouldn't start with a 30 day fast. I'd start with a one-day fast, then move up gradually to where your system can handle it without spilling out too many toxins at once. I have no idea what the above post means by a salt deficiency -- most humans eat too much sodium, not too little, so a brief period of relief is probably fine, If it's iodine he's referring to, you can get that from seaweed better than from table salt.
Many people opt for juice fasting .It is important to ensure adequate intake of vitamins and nutrients during fasting. There is low sodium content of most fruits and vegetables so there may be salt deficiency. Salt deficiency can lead to weakness, headaches, lightheadedness etc.It is better to consult a healthcare professional before starting this juice fast. Do write to me again.
Best luck and regards!