Inflows and Outflows
In most watershapes, we circulate and treat water through use of pumps and filters – and although we still don’t think about it much these days, we do so because fresh water is in precariously short supply and we can’t simply fill and dump it as we please. Yet even a perfect watershape – that is, one devoid of leaks, never subject to splash-out and never in need of backwashing – occasionally requires the addition of new water if only because evaporation will carry it away, bit by bit.  In fact, there’s no way to cut Mother Nature out of her share, or to keep her from