Transcript
Tools for Cleaning
Chapter 7
Objectives:As a result of successfully completing this chapter,
students will be able to:
Explain the importance of using purified water in the cleaning process, and review procedures to test for water purity
Discuss factors that impact water purity Provide an overview of components and products
that are important in water purification systems Explain the basics of distillation, deionization, and
reverse osmosis water purification systems Identify common cleaning chemicals, and review
basic protocols for their use Note the importance of bushes, cloths, and sponges
in an effective cleaning process
Before the cleaning process can begin…
• Central Service Technicians must ensure that they have the proper tools necessary for a successful process
• Testing for Water Quality
Tap Water• Raw Water that comes
from the city’s water supply, it is clean and safe but not pure
• There are many impurities in water that can impact cleaning processes
• Water from any source contains minerals, dissolved solids, particles, gases, and organic and non-organic chemicals
• Some water also contains bacteria, algae, and parasites
Purification Testing
Water Testing• Can be
performed by facility personnel, manufacturers or distributors of cleaning products, or contract services
Obtain a sterile plastic container
Locate the source where the final rinse enters the sink (manual system) or cleaning equipment
Let the water flow for several seconds, then fill the collection container
Close the lid tightly and send the container to the testing facility as soon as possible to minimize changes that can occur over time
A report will be generated
Water Quality Report Information
• Conductivity• Total Dissolved Solids• pH• Chlorides• Silicates• Particle Count
ConductivityA measurement of the ability of
water to carry an electric current
Resistance Testing
•Measures freedom from dissolved solids by measuring conductivity• Liquids must be able to
resist 300,000 ohms
Total Dissolved Solids
Elements such as iron, magnesium, silicates and calcium that may cause stains on
processed items. (Hard water)
Silicate
A mineral commonly found in water that is derived from silica found in quartz and
other components
Acidity or Alkalinity
(pH)
pH interactions can occur between water and cleaning products
Chlorides
A compound commonly found in water that is created when chlorine is
combined with another element or radical. In high concentrations,
chlorides will damage instrument finishes
Other Particles
Particles (usually small solid objects like pieces of rusted pipes, and small pieces of plastic, etc. that can impact water quality
Water may also contain sediment, such as sand, clay or dirt
Turbidity
Occurs when water contains sediments or solids that, when stirred, make the water appear
cloudy
Water Purification Systems
Filters•Made of different materials depending
on the intended use
• Filter size is measured in microns
• Specific filter applications should be are different and they must be applied, used, and maintained according to manufacturers’ recommendations
Granular Activated Charcoal(GAC)
•Used to remove chlorides in water.
•Used as the first step in deionization and reverse-osmosis systems.
•An acceptable chloride level in final water rinse is 100ppm or less.
Softeners
•Used to remove calcium and magnesium (the main elements that contribute to the hardness of water)
•Uses a cation resin tank
Cation Resin Tank
A tank into which untreated hard water flows, and in which sodium ions
are exchanged for calcium and magnesium ions to produce soft water
Purified/Distilled Water
•Water that is heated to evaporation and then condensed. The process leaves impurities behind
•Distillation removes dissolved solids, gases, organics, particles, bacteria, pyrogens, and endotoxins
Pyrogens
• Pus-producing organisms that can cause fever
Deionization• The process by which ions with an
electrical charge are removed from water
•Deionized water is used in heating/cooling therapy units and in the final rinse water for automated cleaning equipment
Reverse Osmosis Water
•Water that is purified using a molecular filter system
• This process removes most dissolved solids, and organics and is capable of bacteria, pyrogens, and endotoxins
Cleaning Chemicals
Enzyme Products
• Contain protease enzymes that are useful for breaking down soils, like dried blood and tissue
• Enzymes help detergents work more quickly
Detergents
• Contain emulsifiers and chelating agents
• Break down soil and suspend it for easy rinsing
Descalers
•Descalers are not typically required if water quality and detergent mixtures are correct
• Removes/prevents formation of the chalky, while substance that forms on cleaning equipment and sinks.
Pre-soaking Chemicals• Substances used to prevent the drying of
blood and tissue after us
• Common pre-cleaning agents include; enzymatic detergents, detergent solutions, enzyme-germicide detergents, and plain water
• Pre-cleaning should be done immediately after an instrument is used
Manual Cleaners
•Help water penetrate soil faster
• Should be low-foaming and free-rinsing
• Follow manufacturer’s instructions for dilution, mixing and use
Mechanical Cleaner Chemicals
• Follow the equipment manufacturer's written instructions
• Should be low-foaming and free-rinsing
Safety Concerns• Follow manufacturers’ instructions for
handling and use
•Wear recommended Personal Protective Equipment (PPE)
• Review Material Safety Data Sheets (MSDS)
•Dispose of all chemicals properly
CLEANING TOOLS
• Brushes• Cleaning Cloths• Sponges• Stylets• Pressure Nozzles•Air Nozzles•And more…
Several Tools are Needed for Cleaning:
Brushes• Brushes should be
disposable
• If they are reusable, clean at least daily to and subject to a biocidal process to prevent them from becoming a source of contamination
Brush Safety
• Brush items under the surface of the water to prevent the formation of aerosols
Cleaning Cloths & Sponges
• Use lint-free or low-lint cloths
• Change often
• Verify that cleaning chemicals are not deactivated by cloth
• Sponges cannot be cleaned for reuse
• Discard daily
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