What are pH, EC, TDS, and PPM and How Are They Connected?

What are pH, EC, TDS, and PPM and How Are They Connected?

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If you’re new to hydroponics and have NO clue what all of the terminology means, this video is for you. Even if you’re an intermediate grower and want to know what EC is, what TDS means, which you should use, and how it all connects to pH, make some time to watch this one today.

The truth is that EC or electrical conductivity is the purest way to measure your nutrient concentration. TDS or total dissolved solids is a calculation based on EC that meters perform internally. TDS is measured in PPM, or parts per million and the calculation can vary based on the conversion factor.

This is why you must know the conversion factor your meter is using if you’re using TDS. Or you can simply switch to using EC and never have to worry about it again!

Today’s video is sponsored by Apera Instruments, makers of water and soil testing probes and meters. They kindly donated the PH20 and PC60 meters for me to make this video.

IN THIS VIDEO

→ http://aperainst.com/
→ PH20 pH Tester: http://amzn.to/2hKrBEM
→ PC60 pH/EC/TDS Tester: http://amzn.to/2z9YfGQ

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52 Comments

  1. I love the device

    but I’m having trouble understanding the ppm reading

    instead of it reading 1500 ppms or so it goes directly to 4.9 or 5.0

    I’m sure it’s me I’m just confused do anyone have a solution( lol I guess pun inteded)

  2. Are cheaper ec meters the same principle as ph meters you get what you pay for and are the ones that can be calibrated better than the ones that can’t be

  3. This is an excellent video of very important and useful information for those of us venturing into hydroponics. I know this was a lot of work so, thank you. The explanations were great. The product details were interesting but less important to me since I already have different meters. The background music was a bit distracting. Keep making videos for those of us who like you are learning gardeners. Thanks!

  4. I calibrate my blue lab once a week. It’s a bit excessive but I watered a few times without calibrating and my plants acted a little weird for a few weeks. After calibrating weekly I havnt had problems. Idk for certain what happened but I do know I havnt had any problems

  5. Great info…but that extremely annoying back ground music made it hard listening to the information. Again Great info but please stop that annoying background noise. Peace!!

  6. Great video but having the chipmunks over dubbing your speech is to much. Or perhaps turn it down if you have to have it. But thank you for the knowledge. That just makes it little hard to understand what you’re saying.

  7. This is all Useless… all he did was pour human shit into a glass of water. An then used a machine to tell himself how much riots of shit is in that glass of water.. Dude, just Look at the Color of your Shit Water… To get that 40% shit and 60% clear water. What your looking for is that
    Light Brown Gravy Color.

    Eye ball it, Be a man.

  8. Water PH: high, Nute PH: low. PPM to low plant will deplete nutes making PH rise. PPM to high plant will take more water out than nutes making PH go down.

  9. Thank you for this video!!!!!!
    Can you tell me if the AC INFINITELY ph pen is that made by Apera ? I can not find a set up video on that ph pen

  10. Great video. Forgot 1 little thing about the pc.60. When reading ppm’s. It will automatically switch from ppm to p.p.t. ( parts per trillion ) if your reading is above 999 ppm. To convert? Take the p.p.t number. Multiple by 1000. There’s your ppm number. It will switch over. So be aware of what the reading is on. Happy grows people 😂

  11. Good explanation and thanks for that, but for what its worth, I would kill the background music which I found added nothing and became annoying, the mix was just way too high .

  12. It is See-mens not Simons. Named after Werner Von Siemens, 13 December 1816 – 6 December 1892) a German electrical engineer. Established the Siemens company a multinational conglomerate that excels in high engineering especially regarding electrical engineering.

  13. Thanks for the explanation on how ec is the baseline and ppm is measured off that number. Nobody mentions this and it’s HUGE!

  14. Kevin is the first video I’ve seen that puts all this into plain english.
    My meter (purchased in 2023) says"TDS/EC Meter",. then doesn’t have those ‘name’ shown on any readings. Instead it shows numbers for "ppm" and "us/cm" (the u is funny looking, so it isn’t a letter but a math symbol.)
    So after reading tons, and watching this vid like 4 times (cause I’m not into calculus), I’ve finally figured out:
    1) TDS shows on my meter as ppm, which is converted inside the meter from the EC value at a conversion factor of 500 or 700 or 570, and who cares because we don’t need it so ignore the TDS/ppm just like Kevin says. You can’t use any chart online to equalize that to a EC level without knowing the conversion factor your meter is secretly using so skip that number completely.
    2) The us/cm is EC in microseimens. Convert that to milliseimens by moving the decimal over by 3 points…. So 1230 us/cm converts to 1.2 EC. And that is the number you need. (so a 800 us/cm would be 0.8 EC If you had 870, round up to 0.9 EC)
    Find a chart online that you can copy into Excel or print out, that shows you what EC is needed for each type vegetable or fruit: Like strawberries need EC 1.8 to 2.2. Peas need 0.8 to 1.8.
    You only use the TDS/ ppm to get a EC value, and your meter already gives that to you nowadays, it just doesn’t ‘say EC, it says us/cm ………because math people love to complicate our lives.
    So ignore the TDS/ ppm completely,.
    Just like Kevin says in this video.
    For PH… do I sound like someone who wants to calibrate a ph meter? No. I bought little water test PH strips. Works great. 😁🤣🤣

  15. Why not use say Coke to lower pH? Baking soda to raise it? Vinegar to lower. It’s not the space program people. No need to buy pH up and down $$$$. Simple stuff you already have at home.

  16. This item you are viewing is a 3 in 1 Nutrient Tester to determine the nutrient levels in a solution with 3 parameters (CF, EC and PPM).(YM-2005A) If you use hydroponics to grow fruits and plants, it is necessary to know the strength of nutrients.

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