One-neutron hydrogen, "deuterium", is vital to nuclear-energy generation in and over Venus, and elsewhere. Venus starts with 2H proportion: 0.016. This is considered a high proportion, as solar-system atmospheres go; but I'd not pump this mix into a reactor.
Over Venus, most water and hydrogen-bearing compounds float in the cloud-layer. Here we get the Girdler sulfide process for free. Said process is cost-effective similarly for the surface mines, as a byproduct of their air-conditioning and water imports. In any place, the Girdler process boosts that 2H ratio to 0.15-.20. Still not good enough by itself, but at least at the point a distillery can sort the rest out.
Girdler works with two sieve tray columns. One column works at 300 K, uncomfortably warm to us but well-within the tropical range of Venus’ 50s° latitudes; and the other at 400 K, the conditions surrounding Venerean industrial cities, which I'm hanging low. That the hot tower sits below is frequent for Girdler mills on Earth. They'd be tethered together; aerofoils (kites!) should do it.
Every city will keep the light water. The floating farms, for their part, sell the heavy(er). I haven’t considered who distills the floaters’ heavy water; I assume a central distillery.
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