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Note I was careful to say TSP90 which has nothing to do with TSP (tri Sodium Phosphate). TSP I think has been mostly removed from the market. The TSP90 is a substitute for TSP, but it's actually Sodium metasilicate, which has some of the desirable properties of TSP but isn't actually TSP, nor is it nearly as strong in it's action.
I think Red Devil who makes TSP90 wants to remind us it does some of the same job that TSP formerly did, but they chose a deliberately confusing name.
Ok…I retract my statement but still wouldn’t feel comfortable using TSP90.