Generally speaking there are two different types of lead acid battery, Starting and Deep Cycle. If a starting battery is routinely deep cycled (discharged below 20%-50% of max capacity) it will generally fail after 30-150 cycles. The same starting battery will last for thousands of cycles if it is just used normally (2% - 5% discharge).
These phosphates precipitate the solids to the bottom of the boiler drum. At the bottom of the boiler drum there is a bottom blow to remove these solids. These chemicals also include anti-scaling agents, oxygen scavengers, and anti-foaming agents.
Hydrochloric acid, or muriatic acid is a very common acid that is formed when Hydrogen chloride when hydrogen chloride dissolves in water. Both hydrogen chloride and hydrochloric acid are corrosive and may cause burns on contact. It is used in the process of making tin, for cleaning metal products, in electroplating, cleaning out boilers, as a catalyst in some chemical processes, to make fertilizer and dye, in photograpy, textile and rubber manufacturing.