I wonder how environment friendly that tiny dish washing machine and its detergent is. MAybe it can save some water instead of trivial manual washing, but how p

I wonder how environment friendly that tiny dish washing machine and its detergent is. MAybe it can save some water instead of trivial manual washing, but how pollutant is that waste water? Isn't it better to manually wash those 2 to 6 dishes, 1 to 3 glasses and maybe 1 pan?