Tarig, I just thought of something. To keep things simple, have everything sealed air tight except for filling the water to be heated and the water to be drained. As the dirty water evaporates, then condenses as clean water, the amount of water will not change. The pump would be to maintain vacuum (remove air as needed). And when the purified water is to be drained, the vacuum pump could be disconnected, or open the inlet (fill valve). Allowing air into the purifier will allow for the clean water to drain. A tube may need to be placed through the purifier where you want steam to condense. The tube could allow air or other water if you want to help cool the steam. With that thought in mind, putting something over the area where steam will condense might work better or at least help.

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Tarig, I just thought of something. To keep things simple, have everything sealed air tight except for filling the water to be heated and the water to be drained. As the dirty water evaporates, then condenses as clean water, the amount of water will not change. The pump would be to maintain vacuum (remove air as needed). And when the purified water is to be drained, the vacuum pump could be disconnected, or open the inlet (fill valve). Allowing air into the purifier will allow for the clean water to drain. A tube may need to be placed through the purifier where you want steam to condense. The tube could allow air or other water if you want to help cool the steam. With that thought in mind, putting something over the area where steam will condense might work better or at least help.