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.
In WV as of Dec. 2009, the 1lb tanks are about $2.65. Refilling a 20lb tank costs $13 ($0.65/lb), swapping it for a 15lb filled tank is about $18 ($1.20/lb), saving you around $1.45 to $2 per tank. That would take 10-14 tank refills to pay for the device, before you would save any money.