Return to the Ponds & Aquatic Plants Forum | Post a Follow-Up

Nitrate High...What to do?

Posted by asun1 Z8 (My Page) on
Wed, May 21, 08 at 16:09

I need some help. I did a water test, and my Nitrate is a bit high...the test water is purple! Isn't Nitrate supposed to be at 0??? I do regular water changes and my filter is working fine. Not too sure how to lower Nitrate...always though that was caused by fish waste and other gunk in the pond, and water changes would take care of it. But my water was crystal clear, and no gunk on bottom. What is causing the Nitrate problem?

Now I have to confess, I did something to try and fix it...not sure if it was the right thing to do. A local Koi breeder told me to put some Baking Soda in the water...1 pound. So I did, and now....3 days later, the water is cloudy, and the Nitrate is a bit lower, but still high. Should I just wait it out, or drain the water and start over?

Follow-Up Postings:

RE: Nitrate High...What to do?

  • Posted by larryl 7 Southern Oregon (My Page) on
    Wed, May 21, 08 at 16:40

I am assuming you really do mean nitrate and not nitrite. Many folks confuse these.

Nitrate levels up to 40 PPM really aren't a big deal. Floating plants love nitrate, and will quickly use it up is you have enough healthy plants. As long as your floating plants have enough potash and micro-nutrients they will consume the nitrate. Do you have floating plants like water hyacinth, duck weed, azolla, or maybe watercress. How do they look?

The baking soda has nothing to do with the nitrate levels.

RE: Nitrate High...What to do?

I have hyacinth....they are small, not growing too much. On another post you told to try some iron for them. I am going to pick some up tonight and try it. I was thinking if I get the Hyacinths going it would help....Thanks.

RE: Nitrate High...What to do?

  • Posted by hoovb z9 Southern CA (My Page) on
    Thu, May 22, 08 at 0:17

One way to reduce nitrate is through a water change, unless your source water is high in nitrate in the first place. Have you had an algae bloom at all?

NitrAte is part of the normal pond cycle. Fish excrete ammonia. Beneficial bacteria break down the ammonia into nitrItes. Other beneficial bacterial break down the nitrItes into nitrAtes. Algae and other plant life use the nitrAtes.

The purpose of adding baking soda is to increase the kH of the water. A very low kH can possibly (not probably, just possibly) lead to pH crashes, which can kill koi.

Ammonia and nitrIte are toxic and should be at zero or close to it at all times. NitrAte in moderate amounts, (less than 40ppm) is ok.

RE: Nitrate High...What to do?

I had a nitrAte problem a month back. Threw some WH in there and BAM; no more nitrAte problem....

But the next morning..... fish got jiggy and BAM! fish eggs and foam problem (ammonia).

Bless those fishies...


RE: Nitrate High...What to do?

What is "WH"?

RE: Nitrate High...What to do?

The easy way to say Water Hyacinths. And you don't have to remember how to spell it. Glenda

 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Ponds & Aquatic Plants Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here