Self-checking of pure and ultrapure water systems: Regular Inspections
How did you find the key points concerning management of pure and ultrapure water systems in “Routine Inspections” in the previous column?
This column will introduce “Regular Inspections,” matters to be carried out once every six to twelve months.
Recommendations for regular replacement of consumables
Have consumables passed their expiry date for replacement?
As this is a vital point that greatly affects the deterioration of water quality, consumables should be replaced regularly.
|①Activated carbon filter
|：Prevents early deterioration of expensive RO membranes and loss of water supply pressure at later stages
|：Prevents early deterioration of ion exchange resin at later stages
|③Ion exchange resin
|：Prevents deterioration of water quality
|：Inhibits the outbreak of bacteria and rise in TOC value
|⑤Air vent filter
|：Prevents contamination of pure water in the tank by carbon dioxide, etc.
【Precautions for replacement of consumables】
☑Turn off the equipment before replacement.
☑Do not let the water leak sensor get wet. (If it does get wet, wipe off the water with a dry cloth.)
☑Do not touch wet areas with bare hands.
◎Regularly measure residual chlorine using a DPD reagent!
Method of checking: Use a cup to dispense water that has passed through the activated charcoal, and add the DPD reagent. If the aqueous solution turns pink to any degree, there is a residual chlorine leak.
Recommended for these users!
This is recommended for persons who perform replacement of consumables but who are uncertain over whether the cartridge is correctly fitted. This should be performed regularly and should be used as a guideline for replacement of the activated carbon cartridge.
Cleaning of the debris removal mesh (strainer) at the water supply source
In many equipment models, a mesh is installed inside the water supply tubing or joint connection to remove debris from the raw water.
When this mesh becomes clogged with debris, the equipment may stop due to a drop in water supply pressure. Regular cleaning will help prevent equipment trouble.
Water pipes in old buildings may also contain large quantities of iron rust.
If the strainer frequently becomes dirty, we recommend the installation of an optional pretreatment filter.
The above introduced key points in “Regular Inspections,” by which persons using pure or ultrapure water can inspect equipment on their own.
- Recommendation for regular replacement of consumables
- Cleaning of the debris removal mesh (strainer) at the water supply source
Make a habit of routinely checking these points, and strive to replace consumables before water quality declines.
The next column will introduce key points concerning equipment management in “Dealing with Long Downtime.”