Can you acid wash your pool without draining?

filling with water will dilute the acid just fine ,, if the pH level is still high add sodium bicarbonate,(baking soda)

I totally disagree with the above answer. Unless the local fire company is filling the pool and the truck is on-site the very minute the acid washing is completed, you must neutralize the acid. Even then, unless the pool holds less than 5500 gallons (the size of the delivery), you still need to neutralize with TSP (tri-sodium-phosphate). Muriatic acid can reek havoc on marcite given enough time, so I recommend TSP every time, without exception. -Bill