I have seen some images of crystal clear fish ponds that show off rock colors and fish like Lost Lake in New Mexico; however, they achieve this with a very rigorous supplemental regiment.
If ya enjoying hiking and camping, Lost Lake is an amazing hike and beautiful lake at 11,000 elevation and fish in it. I don't know if it is open anymore with all of the state budget cuts.
Appears the flack bottle bacteria comes from folk who want nearly instant results within days like a chemical. Seems folk think water chemistry won't determine the effectiveness of dosages. The dosages on the bottles are just "recommended" for "normal" water chemistry.
As a farmer, I am quite skeptical about all the organic hype, but the science and documentation still makes sense.
Don't think bacteria bottles will act like a chemical such as fixing your problem within a few days. It is a balance game that requires constant maintenanace either by nature or supplements to nature. Nature is also not a fast process. Ya just don't "all of a sudden" have enough bacteria. The colonies must settle and grow appropriately according to your particular water chemistry and enzymes to help with the overabundances of nutrients and minerals.
Problem is bottle bacteria is expensive just like Miracle-Gro and all of the other oragnic fertilizers for households. I farm for a living and I would use Miracle-Gro or these other organics except it is not realistic at all due to the price tag on such a large scale.
Microbe-lift has some very good documentation. Even has a video portraying how all the different liquid bacteria vary by putting them under a microscope. They actually prefer ya to NOT use too much of the beneficial bacteria. They also state that water chemistry will determine dosages. Recommended 7mg/L of dissolve oxygen to maintain healthy bacteria, a constant flow of ammonia such as from fish or decay, and water temperature and alkanity determine effectiveness of the bacteria amongst other variables.
From what I have read, takes about 4~6 weeks to naturally cycle water completely and process restarts every year in Spring. During this cycle, I am told the water will go through all sorts of stages until everything is balanced. Some balance faster than others depending on their water chemistry. I am told this cycle can be shortened with fishless cycles by adding Ammonium Hydroxide maintaining a 5ppm. Once the 5ppm is depeleted within a day, then the water is cycled. Continue the ammonia dosages until fish are introduced. Ammonia and dissolved oxygen is required for beneficial bacteria to survive. The natural way of ammonia is fish feces and decaying of organic stuff. Once all ammonia is consumed or dissolved oxygen reduces, then the beneficial bacteria colonies begin to hibernate or die off. Google "fishless cycle". Also, too much ammonia will gorge beneficial bacteria to death.
From what I have read, big difference between liquid form and dry form bacteria is that the liquid are hibernating live bacteria in a diluted solution of hydrogen sulfide and the dry form is bacteria spores with chemical inhibitors to keep them hibernated. The chemical inhibitors are only bad for the water if ya put it too much dry bacteria spores. The liquid bacteria is capable of containing a special bacteria that converts nitrates back to nitrogen into the air; this is why so many recommend keeping a hole open in your pond water during winter to allow these naturally occuring gases to escape. Only particular types of bacteria can survive a wide range of temperatures; I am told this is why pond waters go through such big swings in the Spring while nature is working on balancing everything.
Sludge is created due to beneficial bacteria unable to keep up with the decaying materials and this is why there are natural enzymes to supplement the bacteria. Enzymes are varying amino acids to help control the potential overabundance of organics and do not increase dissolved oxygen depletion. This is why barley is beneficial. The decomposition of barley helps to create enzymes. This is why folk recommend cleaning leaves and stuff out of the water because nature's process is quite long to grow the enyzmes and bacteria to naturally deal with the material.
The "our water gardens are closed systems so it is different" bugs me a bit since a naturally forming plateau lake in my area are closed system ecosystems, containing fishing, and water changes made possible from rain runoff from the land and massive evaporation or absorption into the land. I figure the water chemistry of rain runoff noticeably changes as well as it progresses through various farm soils till it is deposited in the lake.
I enjoy researching and reading. I have not read anything, beyond disturbed consumers, that has disputed this stuff because I quite simply want to do this right without all the grief water can create in nature.
Nature is very slow. Ugh, organic farming on huge plots of land is quite volatile and risky and always brings in a smaller paycheck.
The Microbe-lift appears to do quite well. I will see here after this summer. My water is still crystal clear. I started doing a fishless cycle.