Masonry Magazine April 2001 Page. 19
MASONRY COMPUTER ESTIMATING
Masonry contractors do not subcontract bricklaying, why should cleaning be subcontracted?
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MASONRY APRIL, 2001 19
consume the difference in initial purchase price. Standard washers, those referred to as having a "chemical injection system," use a venturi or siphon system to handle chemicals and require the use of water to carry the chemical through the washer. There are cases when introducing water into the chemical is unwelcome, especially in restoration cleaning, when it is desirable to apply only pure chemical or a carefully measured dilution of chemical. In addition, venturi and siphon systems require water pressure be reduced to carry chemical. Chemicals can be introduced into the water stream either before the water is pressurized by the water pump or at the end of the wand. In either case, care must be taken when moving an open container of chemical so it is not spilled or splashed on the operator or other workers. Moreover, siphon systems can carry chemical only about 25 feet. The alternative to avoiding the above problems is to apply the cleaning chemical by hand or with a garden sprayer and to wash it off with a washer - a tedious, time-and cost-consuming double work.
Washers made specifically for cleaning masonry, referred to as "acid induction" machines, avoid double work. In addition, acid induction machines are designed to handle the harsh chemicals used in masonry cleaning. They do away with open buckets of chemicals by providing sealed, delivery-ready storage. Besides the consideration of hot water or an acid induction system, other features should be sought when buying cleaning equipment:
Hoses-double-steel, wire-reinforced pressure hose of substantial length precludes the need to constantly move the unit as work progresses. Double reinforcement provides longer useful life because of the extra protection against nicks and cuts.
Water recirculating tank - a water recirculating tank allows the washer to idle without overheating the water pump. This keeps the operator from having to climb down to shut off the washer each time work pauses.
Trigger gun - a trigger gun is preferable to a weep system that allows small amounts of water to flow