Which bottles does it fit?
Standard soft-drink bottles. It is not designed for mineral-water bottles, which tend to have a narrower neck. Check the thread before you fill anything.
How do I switch between mist and jet?
Twist the nozzle at the end. It moves through a fine mist, a wider cone and a narrow stream, so you can set it while you spray.
Can I put plant feed through it?
Follow the directions on whatever you are using, and rinse plenty of clean water through the head afterwards so nothing dries in the nozzle. We can't advise on specific products.
The spray has gone weak. What now?
Almost always it just needs pumping again. If it stays weak, check the nozzle for grit and make sure the hose reaches the bottom of the bottle.
Is it any good for seedlings?
That is where a mist earns its keep. Water poured from a can moves compost around and knocks small seedlings flat; a mist settles on the surface instead.