I have a whole lot to chat about,
Parka
, Self Report, Comprehensive Style!
1. About the Czech style air lifts. I made 4 different sizes from 1/2" ID to 1 1/8" ID and I only did three comparison tests vs air stones using the same air source and every time the Czech style about doubled the water flow compared to an air stone.
Even using a small air pump, only 1.5 watt, it worked very well on the 1/2 and 3/4 pipes. Eventually I will be going full tilt using this Czech style airlift in all my tanks and outdoor pool(s), very impressed!
2. The Hard Working Akron. Yeah sure, removing the gravel was easy compared to removing the lava rock. The day after I removed the gravel, I took only two handfuls of lava rock out and my will to work vanished! Even though the gravel is heavier than the lava rock, the gravel scooped up nice and the lava rock is very much more difficult to remove. Finally today I got a good start and I plan to get back after it in the morning. Here's a few pics to prove it! Just a slow unpleasant task.


3. The outdoor pool pond. I tested the water for nitrates only, ZERO! But back in Feb. we had a big warm up and for two mornings and one evening another Great Blue Heron was stopping by again. I chased it off and took about 1/3 of the water lettuce from the Chicago and put it in the pool and it seemed to be enough to make the Heron lose interest, pretty cool.
But then we had another hard cold spell, a couple nights went below 20 degrees F and several other were in the mid 20's and it wiped out the water lettuce. It was still there and floating and obscuring the view of the Heron, I think, but earlier this week I netted it all out and then through in another fresh batch of water lettuce, again borrowed from the Chicago tank. In those four weeks when I removed the first batch, it all grew back and pretty much had the whole of the Chicago covered again.
The bad news is that it appears two of my seven larger Koi are missing! Missing is Lake Erie and Decoy. I named Erie because he looked the most natural of all my Koi. He was silverish grey with just a small streak of orange on one side. And with a name like Decoy, I fully expected her to do a better job hiding from from the beak!
4. The Mighty Chicago. Every single time I test for nitrates they look to be around 5 or less than 10 ppm. My hunch is that the water lettuce is the reason why, it takes over the surface except where the 8 air stones push open the surface. And also there is NO algae in the Chicago and there hasn't been any for at least 9 months, maybe longer. Nitrates are the only thing I test for and even though they are not too high, I still like to to a water change 3 or 4 times a year on the Chicago. The Cleveland on the other hand, I just did a water change and cleaned the glass a week ago and already the glass is getting furry!
The substrate in the Chicago is a full 7" deep and I'm using a sprinkler hose to run the under gravel water flow and that hose, spread out as it is, it probably doesn't have the uniform distribution as the pipe system that was running in the Akron. So I'm VERY curious if there might be sections of substrate that anaerobic? My understanding is that anaerobic bacteria dispatch of the nitrates BACK to a smaller amount of nitrites which in turn get consumed by the aerobic bacteria.
5. I probably forgot a bunch of stuff but I will remember and Chat Ya Later, GOOD Evening!