Hi all! My name is Martin. I and some friends found a quarry in our city. After asking for permision to the land owner, we dove there, water was not clear actually.
So we decided to see if it was posible to make it better. That was 4 years ago.
We installed some ultrasonic devices to control algae. Also we use straw from time to time. We have never used quemicals.
Water visibility has impreed a lot. We have had like 20 feet clear waters. Since last year something is going on we dont understand and we dont have access to someone with knowledge to help us.
A layer of brown water appeared once , right on top of the bottom. It was like 2 meters wide. Cero vis there.
That layer despeared after a couple of months (appeared in summer, desapeared in the winter). This years appeared again in the winter but this time was on the surface. Below this layer water was cristal clear.
We took a sample and made it analice. All we got was that a a Mesophila bacteria was there, not dangerous. I supose that is good...
When water started to got warmer thar brown layer started to "move" to the bottom, and remains there now...
The clear layer water analysis shows water quality is good, ph 7.2/7.5, not amonia, no nh3/2. But int that brown layer there is a really strong sulphur smell. We noticed it when whe dive inside that layer or when I take a sample ina bottle and open it in the surface. Analisys of that water shows sulphur.
I have not been able ti find a place to make a good water analisys to know what is that brown layer.
Can anyone tell me what this is? how to fight it?
Also, thus forum is awesome. A lot of information, can you point me if there is a subforum with articles for reading? I want to learn about the lake quemistry/cycles, etc
This quarry is like 1 acre, 40 feets deep. Temperature now is 23 C till 7 20 feets, then in the brown layer temperature drops to 17C
I hope someone can clarify me the situation.
Question aereation of this brown layer would help?
Thanks in advance,
Martin
Last edited by Martin-dive; 01/26/16 05:37 PM.
