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oliver90owner wrote:Re the solder.
Silver solder is a hard solder and has a much higher melting point than plumbing solder, so is not sold for plumbing. The issues of silver in potent water are minimal, I would think (compare with lead pipes of yesteryear) but should, I suppose be heeded. That said, here we have a system with no chlorine and very most certainly, if the solder is on the upstream of the vapour, there is no chance whatsoever that silver halide (insoluble in water and breaks down to silver metal in light) which is a solid is going to get carried over to the product. It would (if anything) finish in the remains of the wash). I certainly would not use silver solder due to the cost, but would not be replacing it, either.
Re the flux - acid or water based. Even water based can be acidic, I suppose. Many acid based fluxes are, or have been, used for plumbing. The flux is there to 'wet' the joint and will not be there when the solder has replaced it and filled the joint. As long as any flux is removed from the metal (inside and out), there should be no issues with later corrosion, acidic or neutral.
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