New portable shower -- "Rinsekit" -- has anyone tried it?

I just modified a black plastic 3 gallon pump sprayer that someone gave me and used it last week when dry camping at a beach in RI. I used it to rinse the saltwater of after clamming and spear fishing. I took a piece of hose and drilled about 10 #40 holes in it to make a shower spray. I used the sprayer that came with it to rinse the sand of my feet before walking into the MH. That sprayer head uses much less water. The tank lasted all week.