Yes, provided it is completely soluble in water.
Yes, although it is better to store the pipe away in a dry place. if the pipe is buried this will serve to insulate it against severe frosts. Remember to remove the end bungs and drain the system.
Yes, but if you are in a hard water area, we recommend you bury the pipe in the ground or cover with mulch to avoid drying out and being blocked by calcium.
This is entirely up to you, but an average of 4 litres per metre per hour (from the tap), you can calculate how much water goes into your garden.
Use a 1/2" hose pipe for supplying the water from your tap/butt and turn the tap down. Alternatively you can fit a 4:1 Pressure Reducer or an In-Use Plastic Tap to slow the water down.
Use more hosepipes or a larger hose pipe (i.e. 3/4" or 1") to supply water from your tap/butt. Open the tap up slightly, or raise the height of your water butt. The secret is to increase the colume of water while maintaining a low water pressure.
Dirty water - remedy, use a water filter or setting tank.
Hard water - remedy, bury the pipe beneath the surface so that the sun cannot completely dry it out, or use a Polar purification magnet to prevent calcium deposits.