What do the colors on a water test strip mean?
The pH scale runs from 0 to 14, with each number assigned a different color. At the bottom of the scale sits red, which represents the most acidic, and a dark blue at its opposite end represents 14 and alkalinity. In the middle zone, the pH scale becomes neutral. Milk has a pH of 6 and a neutral off-white color.
What should my test strips read for my fish tank?
Testing Tips The pH should be tested weekly, since natural materials in the aquarium, such as fish waste and decaying food, can cause changes in pH over time. This test kit measures pH from 6.0 – 9.0 in fresh and saltwater. pH below 6.0 will read 6.0 and pH above 9.0 will read 9.0.
What does green mean on a pH strip?
Universal indicator
| pH range | Description | Colour |
|---|---|---|
| < 3 | Strong acid | Red |
| 3–6 | Weak acid | Orange or Yellow |
| 7 | Neutral | Green |
| 8–11 | Weak alkali | Blue |
What is NO2 and NO3 in aquarium?
Nitrosomonas bacteria convert ammonia into nitrite, before Nitrospira convert nitrite (NO2) to nitrate (NO3). Nitrite and nitrate sound very similar and are often confused, but nitrite is very toxic to fish even in low levels, whereas nitrate is less toxic and builds up.
Why is my alkalinity test yellow?
Total Alkalinity test (drop-test method) If it turns blue to yellow, you’ve got a problem. Again, the likely cause is excess sanitizer. The fix: Obtain a new sample. Instead of adding one or two drops, as per the instructions, go ahead and add four to five drops.
What turns blue litmus green?
Litmus paper, or red and blue test strips, will tell you whether a solution is an acid or a base, but it won’t give you information about the strength of the solution. Universal, or alkacid, indicator paper has a different color to match every number on the pH scale. Neutral solutions turn the paper green.
Why are there two colors on pH test strips?
The more acidic the fabric, the more red the strip becomes, and the more alkaline the fabric, the more blue the strip becomes. Using the indicator scale with the different colours on the box, you can determine how acidic or alkaline the liquid you measured is.