How to use a TDS Meter
17 Comments


Hey everyone, Aquaman here with Water Wisdom
sponsored by WaterFilters.NET. Today’s product is the ZT-2 TDS meter. Now TDS stands for
total dissolved solids, it’s a measure of the dissolved things in your water, and there
are many things dissolved in your water. Water is the universal solvent, they say, and it’s
because water typically absorbs microscopic amounts of just about everything it touches.
So if you’re using a reverse osmosis system to remove total dissolved solids, you need
to own a TDS meter so that you can test the efficiency of your membrane. So, here’s
how this works. This is a little battery operated device, it uses one of those small button
batteries like a watch battery, and it has two little metal probes on the end here underneath
this cap. What you do is take two glasses of water, one from unfiltered water and one
from the reverse osmosis system. Let those sit on the counter and come to room temperature.
So after they have sat for an hour and they’re at room temperature, you take your TDS meter,
and you simply press the button, turn it on, dip it into the water, wait and you get a
reading, write that down, and then clean off the probes. Take a little Q tip or a piece
of paper towel, wipe them off thoroughly, and then put it in the other glass of water,
wait, get a reading, write that down, and now you do some math. Essentially what you
are looking for is 80% removal compared to the incoming unfiltered water. So, for example
if you have 100 parts per million on your incoming unfiltered water, your reverse osmosis
system should be removing a minimum of 80 ppm of that TDS, so you would get a reading
of 20 or lower ideally. If you were to receive a reading above 20, then you are not removing
the full 80% and your membrane is exhausted and needs to be replaced. Obviously your incoming
number is going to vary. I just picked 100 because it makes for easy math, but you want
at least 80% removal of TDS. Owning a TDS meter is a must if you are a reverse osmosis
system owner. There is really no other way for you to scientifically verify if your system
is functioning properly. You need a TDS meter to test for that, and here it is, it’s the
ZT-2. I’m your host Aquaman and thanks for watching.

17 thoughts on “How to use a TDS Meter

  1. It is scary to find out how contaminated city drinking water is, I take this with me to restaurants and test before drinking their water. Some are very scary.

    here is the link to it in case anyone is interested: amzn.to11c5YLd

  2. What is the difference pouring water in a glass Vs pour the water in the TDS Meter Cap and testing it? If I pour water in a Glass and let it sit before I test it, Wouldn't most of the solids settle to the bottom and giving me a false reading

  3. Милый, ты очень хорошо все говоришь, но не мог бы ты повторить все это только по русски!!

  4. I changed all of my filters in my r.o. system and my reading is 141 untreated water and 79 with the r.o.  — 

  5. How do you know when your tester is bad and needs to be replaced? If there is a later model of the meter, would you buy it and compare the readings you get from the newer vs the older one? That would be a great video Maybe you've done that by now.

  6. I have the whirlpool one from Lowe's hardware store it lowered my water from 97 to 7 and the RO unit is one year old so it's past due

  7. 80 percent removal of What? what is it testing that's 80 percent? bacteria?…lead??? what is the reading testing? what is being 80 percent taken out?

  8. I think that zero water is probably a scam. has anyone tested it with an independent TDS meter that DOESN'T come with the Zero pitcher?

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