Durable high-density polyethylene (HDPE) tanks are resistant against UV ray impact and are corrosion-resistant and transparent. They are also used to combat lime residues and deposits as well as germs, bacteria and much more. They are needed for the hygienic cleaning of medical rooms, baths and toilets, commercial kitchens, swimming pools, saunas, thermal baths and for cleaning plumbing fittings. These acidic solutions are a tough test for the seals and parts in the sprayer.