up vote 0 down vote. You can nest up to 7 valid or invalid entries. If you need to have more than that you should perhaps designate a column for your black list of entries that you can add to when an occurrence causes a count that you don't believe should be valid.
So how much does a float tank cost? Float tank prices vary widely depending on the size and the features of the float tank or pod you want to buy. Expect to spend anywhere from $12,000 to $40,000 to buy each commercial-grade float tank needed in your spa.
Floatation therapy is based on a scientific approach to deep relaxation called Restricted Environmental Stimulation Technique or R.E.S.T. for short. The idea was developed in 1954 at NIMH (National Institute of Mental Health) in Washington. Floating in a floatation tank triggers a deep relaxation response, much deeper than normal sleep.