Hi Dave,
Water soluble flux has two opposite attributes.
#1: It is the easiest flux to remove. #2: It is the worst flux to leave behind on a board.
As for # 1, there are many de-fluxing systems out there that are very capable of removing water soluble fluxes and pastes. If you have environmental concerns, then water soluble is by far the best choice. Water soluble fluxes and pastes normally can be removed without the addition of chemicals into the wash water. A chemical-free process is very easy (and inexpensive) to close-loop, helping keep the environmental �police� away. Additionally, cleaning costs are considerably lower if chemicals are not required.
As for #2, water soluble flux should never be left on a board. Care should be exercised to ensure that whatever machine you choose has enough power (HP, pressure, diffusion angles, wattage, CFM, etc.) to effectively clean and dry your boards.
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