By the early 1990s, Rwanda, a small country with an overwhelmingly agricultural economy, had one of the highest population densities in Africa. About 85 percent of its population is Hutu; the rest is Tutsi, along with a small number of Twa, a Pygmy group who were the original inhabitants of Rwanda.
1 Power sanding, stain and seal â This is a very aggressive procedure normally used on decks that have not been well kept or are changing color. The average cost is $2 to $4 per square foot.  Light sanding, stain and seal â This is a general annual treatment for a deck.
Upgrades & Design Ideas For Stained Concrete Pool Decks. As mentioned above, staining a concrete pool deck tends to cost anywhere from $1.50 to $12 per square foot. However, that is for a stain applied to an existing concrete deck. Pouring the deck itself, should that be necessary, will bring with it additional costs that tend to be upwards of $10 per square foot.