Hey,
I will have to disagree with the TheDuchess on some points.
You need to wash clients' hair twice majority of time because lots of the time there is a build up of styling products, or from the low quality haircare that lots of ppl using like tresemme. Use condi or masque is a basic if the hair is short short type 1 or 2 you can skip that part because of the natural sebum production and spread, but normally you are not skipping condi or masque.
The Ecoheads are great, but it is more about how to make the water softer and get better water pressure. The cost for one is around £130. It can fasten the colour rinsing process so it will save more water too. But if you have for example 6 water basins, it can be costly at the beginning
Paper towels are not that eco especially not in the UK where the most common disposal method is landfill. Plus it is not more economical either because the most know brand right now is Scrummi Waffle and it is around £14 for 50 towels you will be able to wash way more for that money
)) (around 10x fully loaded 9kg washing machine). I tried paper towels and it was more expensive.
"Paper hand towels and tissues are a good example of contamination. Although they're made out of paper fibres
they cannot be recycled. "
My water bill in salon of 5 ppl is £500 a year, but I am getting random prices so I will not be helpful here because what I gathered it depends on location.
Find a good quality of fabric towels. Get a decent washing machine (trust me on that I put Miele in salon and it is amazing how much it can save).
Find how much is a consumption of water per 1 fully washed client (2 shampooing, 1 rinse of condi or masque) and just put it in the price.
If you are really busy as you said and you will put the water cost in the price you will be fine