I'm considering building an outside mikveh, with the freshwater section above the rainwater section (with two holes between them, classical "bor al gabai bor" halachic design) but there is no realistic way to keep the rainwater bottom 'bor' liquid during winter. However, it would not be difficult to fill the top section with warm fresh water. Will the slight ice melt of the bottom rainwater section by the top water section be considered sufficient mixing to create a valid mikveh in winter?
Can not do kiss (connection) if the 2 waters are different (temperature)
Think you might want to know
If collected water (not rain water) is frozen and then melted it stops being considered connected