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.
A steam boiler consists of a burner(s), an ignition source, a blower fan, a refractory liner, a heat exchanger, a boiler water regulator, a condensate return pump and at least one. radiator (with a steam control valve). The bottom of the barrel: How the dirtiest heating oil pollutes our air and harms our health.