PH: Conflicting Measurements

by Mark
(Cincinnati)

Hi,

I purchased the PH Up/Down from General Hydroponics.
They have a very complicated graph on the back that not only
covers PH, but nutrient concentrations. When I use this
kit, it looks like the PH is between 5.5 - 6.5.

I also purchased a PH meter that came with two packs of
powder. Mix the first one with distilled water and it
meter should read 6.8. There is a small screw in the back
that you can adjust to get it to 6.8. Then, you mix the
second package in new water, and then it should read
4.0. Once you get this, its calibrated. Its reading
6.9.

So, I purchased some PH test strips. They are reading
3-4.

How do I determine which one is right?

Mark
---------------------------------------

----------------------------------------------------------

Answer from Stella/Simon:
Dear Mark,

I have run into the same problem, as I also test pH of my hot tub as well as my saltwater aquarium. In my experience, pH test strips are useless. pH meters can also be variable, depending on the quality of the device. From my research, unless you buy a laboratory grade pH meter (for several hundred dollars),meters are not feasible. The cheaper meters just are not reliable either.

So this is what I use:for hydroponics, the pH drops from the general hydroponics kit. I just stick with that, and have had luck with this approach. For my saltwater aquarium,which needs to be more precise, I use nothing but Salifert brand pH test kits. I suppose you could use the Salifert kit for hydroponics, but they are expensive. I just go with the GH and forget about it. Try not to make this too complicated.

That is my best advice to you.

Hope this helps!

***Do you have any knowledge on this subject? Then please join in and leave your thoughts and suggestions below. Help and be helped in the Forums!

Click here to post comments

Join in and write your own page! It's easy to do. How? Simply click here to return to Hydroponics Forum.

[?]Subscribe To This Site
  • XML RSS
  • follow us in feedly
  • Add to My Yahoo!
  • Add to My MSN
  • Subscribe with Bloglines
RSS widget


 PROUD OF OUR
 PRODUCTS



All IN ONE GIANT EBOOK

Cheap Hydro Supplies!


   Best Combo Lamp Buy

All Systems DIY ebook

      Grow Box Plans

   Complete Tent Kits
Watch the new Video of
our test experiment of
this Tent Kit!

    Complete Hydro Kits



  Solexx Greenhouses
Authorized Dealer

Bundled Essentials
Package Kits
-
  Best Buy on the 'net


SBI!


 PROUD OF OUR
 PRODUCTS


Cheap Hydro Supplies!


   Best Combo Lamp Buy

All Systems DIY ebook

      Grow Box Plans

All IN ONE GIANT EBOOK

   Complete Tent Kits
Watch the new Video of
our test experiment of
this Tent Kit!

    Complete Hydro Kits




SBI!