DUAL INLINE
TDS MONITOR
Measure the TDS levels of two different water lines, such as
the tap water and filtered water, at any time.
The DM-1 is an ideal monitor to know if a filter cartridge, resin
cartridge or membrane is functioning effectively. Install the
DM-1 so you’ll always know how a water filtration or purifica-
tion system is performing.
®
PARTS
DM-1: Base Unit (LCD Display)
2 x 1/4” T-fittings (standard)
2 x 1.5V Batteries (pre-installed)
Warranty
This product is warranted to the purchaser against material and workmanship for one
(1) year from the date of purchase.
What is covered: Repair, parts and labor, or replacement at the Company's option.
Transportation charges for repaired or new product to be returned to the purchaser.
What is not covered: Transportation charges for the defective product to be sent to
the Company. Any consequential damages, incidental damages, or incidental
expenses, including damages to property. This includes damages from abuse or
improper maintenance such as tampering, wear and tear, water damage, or any other
physical damage. This product is not waterproof and should not be fully submerged in
water. Products with any evidence of such damage will not be repaired nor replaced.
How to obtain warranty performance: Include with the product, your name,
address, phone number, description of problem, and proof of date of purchase and
return to:
HM Digital, Inc.
ATTN: Returns
5819 Uplander Way
Culver City, CA 90230
U.S.A.
Implied Warranties: Any implied warranties, including implied warranties of
merchantability and fitness for a particular purpose, are limited in duration to five years
from date of purchase. Some states do not allow limitations on how long an implied
warranty lasts, so the above limitation may not apply to you. To the extent any
provision of this warranty is prohibited by federal and state law and cannot be
preempted, it shall not be applicable. This warranty gives you specific legal rights, and
you may also have other rights, which vary from state to state.
NOTE: Warranties are product-specific. Third-party products and products deemed by
HM Digital as "accessories" are not covered under warranty. Third-party products
include, but are not limited to, batteries, fittings and adhesives.
Designed in USA and Korea
Made in China
www.hmdigital.com
info@hmdigital.com
Please contact the manufacturer of your water
system for recommended TDS levels.
An ISO-9001 Certified Company
model DM-1
USER’S GUIDE
What is TDS?
Total Dissolved Solids (TDS) are the total amount of inorganic elements, including
minerals, salts or metals dissolved in water, other than the pure water molecules
(H
2
O) and suspended solids. A TDS meter works by measuring the total amount of
mobile charged ions dissolved in a given volume of water, expressed in total quantity
as parts per million (ppm), or in weight as mg/liter. TDS is directly related to the purity
of water and the quality of water purification systems. TDS affects everything that
consumes, lives in, or uses water, whether organic or inorganic, for better or for
worse. For people, a lower TDS level in drinking water is typically preferred.
The U.S. EPA’s Secondary Regulations for drinking water advise a maximum
contamination level of 500 ppm for TDS.
Reverse Osmosis (RO) systems work by filtering the tap water and rejecting the
waste water. You can determine your system’s effectiveness by calculating the
percent rejection rate.
HOW TO CALCULATE PERCENT REJECTION
((Tap TDS - RO TDS) ÷ (Tap TDS)) x 100 = Percent Rejection
Example: Tap TDS = 352 ppm and RO TDS = 18 ppm. Percent rejection = 94.9%.
Contact the manufacturer of your system to determine minimum percent rejection
levels and when to change the filter or membrane.
Useful links for more information
More information on TDS:
http://www.tdsmeter.com/what-is
RO Percent Rejection Calculator:
http://www.tdsmeter.com/what-is?id=0003
DM-1 page:
http://www.tdsmeter.com/products/dm1.html
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