The top section is fast but tree-infested, but soon turns into a pleasant touring paddle. Watch out for a 8m waterfall about 5km down just below a small bridge over the river (inspect from the footpath on river left).
Takeout at the main road bridge in Pontardulais, just before the confluence with the Gwili. Putin at the bridge about a km upstream of Dre-fach. The top section can be tree-infested and there are a number of small bridges further downstream if you want to shorten the trip.
Rainchasers is best experienced as an app.