It is covered by a piece of foam plastic, so some of the water is always being lifted out of the tray on a large, porous sponge surface.
(It; is covered; by a piece of foam plastic) (some of the water; is being lifted; out of the tray; L:on a large, porous sponge surface; T:always)
It some of the water
is covered is being lifted
by a piece of foam plastic
out of the tray L:on a large, porous sponge surface T:always