I can see where your confusion arose. The clay comes as a powder (saves a lot on transport costs and it keeps very well in the powdered form as it is more or less inert in this state).
The clay needs to be hydrated before use to make it active … and well usable!
A standard mix (for washing the face, as a face mask, shampoo for short hair, body wrap, poultice, massage etc) is one part of clay and a tiny bit less than two parts of water. Just put the clay powder in a non-metallic bowl, and pour the water on top. Ignore it for 10 minutes, it hydrates itself and then it is ready to use. If you find there is a layer of water on top of the clay mixture, i.e. if you’ve over done the water, just tip it off as the clay won’t absorb more water than it needs. The standard mix is a sort of yogurt consistency. For washing short hair with this mix, wet the hair, and rub between a teaspoon to a soup spoon of clay mix into the scalp, massaging it for a while. Try less at first rather than more. Then rinse out thoroughly once it has done its job.
For washing longer hair, it is easier if the clay is in a more running consistency. This is why Mrs Green started with a standard mix (so she could use the clay for washing the face and body) and added more water to make it into a better shampoo consistency for her. She would have added more water making it into a kind of milk shake consistency. Again starting with wet hair, she can pour what amounts to about 1/4 of a mug of runnier clay mix onto her scalp, do the massage to clean the scalp and the oil follicles, and then comb it easily down the length of the hair before rinsing. For rinsing long hair, pour water (or stand under the shower in the upright position), then tip the head downwards to assure complete removal - once the clay has done its job it is rinsed completely from the hair.
It is much easier to use in practice than it sounds, because there are only two consistencies, and the yogurt form can easily be diluted into the long hair shampoo form. Once people are familiar with the consistencies, they don’t bother to measure, it sort of becomes instinctive, like we add the right amount of milk to our tea without measuring, weighing of spooning!

If you take, say, 1 oz of clay, and “hydrate” it into a solution of 10 oz of water…….then you have .1 oz clay per each 1 oz of water.

So, why not not skip the whole “hydrating” thing….and just put .1oz of clay into your bottle of water in the first place?

Am i missing something? You’re basically diluting two teaspoons of clay with an un-named amount of water, then further diluting it again with more water! It sounds like, instead of 2 teaspoons, that you should just use a smaller portion of clay in the first place and mix it into some water for use throughout the week…;)

However I have a very clued up Triathlon athlete tester, a female, who typically swims lakes at the crack of dawn for her training. She has long hair and it must get pretty swampy and she needs to shower and wash her long hair every day! She manages to get her 500g packets of rhassoul to last for 15 weeks, so she is using less than 5g of powder per day.

You will know already that you would add water to the clay to hydrate it before you use it, so a 500g packet of rhassoul would yield at least 1.2 liters of washing solution. Initially it is tempting to use too much, but gradually you will find that you can get very good results with very modest amounts.

We have also just been rated Best Buy Shampoo by Ethical Consumer and they gave us a very high ethical score so we a very pleased about that.

sorry I didn’t respond earlier. Somehow or another I must have confused you about our trade relations with Morocco. We do get the clay straight from the mines in Morocco - you will see photos of our journey there on our website. We source all of our Moroccan goods directly from the producers and have very strong and supportive relationships with our producers. We import by ship which is the most environmentally friendly way of moving goods around. If you get a chance to visit the website you will be able to ready about our projects with crafts people and see the photographs of the argan oil production etc (in a womens cooperative) We strongly support trade with developing countries, especially to obtain resources which are not available here.
all the best,
Sally