Inflatable hot tubs consume a lot of water, up to 250 gallons (almost 1000 L) so people will not be happy changing it every week as the water bill will become quite salty. On the other hand, the same water can’t be used forever, so soon or later you will have to replace it, but it all will depend on how often the inflatable hot tub is used and how well you treat the water.
Of the 3 main inflatable hot tub brands, this hot tub is the largest and has the most bubble jets (140). With an 85-inch diameter and 290 gallon capacity, this Intex model provides more personal relaxation space than any other. More room means it is easier to stretch out and easier to sink down so that bubbling water is lapping around your shoulders. That said we think 4 people is the comfortable max.