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Are you sure its chlorine and not bromine? What about Alkalinity?
Are you using Tri-Chlor pucks in the feeder? Usually chlorine in hot tubs is in the form of granules with the name Di-Chlor. If people use a feeder it is usually with bromine. It is my understanding trichlor is for pools and voids most tub warranties.
Yup. Get off the Trichlor. You can use Bromine or Dichlor to sanitize your tub. (I prefer Dichlor and suggest you use a post soak Dichlor dose with a weekly MPS shock). I'd dump the water. clean the filters, (or perhaps even pick up a new one or two) and start fresh with the dichlor routine. What brand of tub is it?