No tiny bubbles in jetted tub


Our jetted tub (18 years old) suddenly stopped putting out tiny bubbles. There is a trickle of water coming out of the knob that controls the bubble intensity. The pump puts out plenty of water. Any ideas?? Thanks, T
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Sounds like a bad check vlave on the "bubble tube". The knob is actually an air admidance valve, meaning the wider it is open the more air (or bubbles) it allows in to the stream. It works off a syphon type affect, as the water is pumped thru the pipes it draws air in via a T via the air admidance vlave, thus bubbles. Water should never come out of this valve, air only in, which is the point behind the check valve. Check along the pipe thats connected to the valve, you should see the check valve. Try cleaning it first, might be something lodged in it. If it's clean, it'll have to be replaced. Should be a fairly low cost item.
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There is a big bubble shortage now, because of the increased use of corn-based ethanol in gasoline. It used to be that a portion of the corn crop was fermented to make bubbles for hot tubs, jacuzzis, Lawrence Welk, etc.
But the demand by gasoline companies, cattle and pig growers, and for corn itself as a food has drive the price too high for bubble vendors.
They are going to plant more acres of corn next season so you can probably get them then.
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