When working hard in heat employees should consume around 250 ml (half a pint) every 15 minutes or 500 ml (a pint) every 30 minutes.
Wrth weithio'n galed yn y gwres dylai gweithwyr yfed tua 250 ml (hanner peint) bob 15 munud neu 500 ml (peint) bob 30 munud.