Most commercial screen printers print garments using plastisol inks, which are easy to use. However, plastisol inks contain PVC and phthalates that are harmful to the environment and have been linked to numerous medical disorders. Plastisol inks also require the use of harmful solvents in the cleaning process. Water based inks do not contain PVC or phthalates and you don't need solvents to clean the screens down after they've been used.
We even use a dip tank that uses filtered rain water from the roof of the workshop to clean the screens. Plus the water butt feeds our jet wash so mother nature is helping us out every time it rains.
Water based inks have the added benefit that they don't have a rubbery feel like plastisol inks or transfer printing due to the ink sinking into the fibres of the garment Thus making them soft to the touch and safe to use on underwear, swimwear and baby clothes.