Pond Boss Forums GENERAL QUESTIONS Muddy water Aerobic bacteria life cycle

1/4 acre pond in woodland area in Ohio. Pond is now 4 years old. Main issue seems to be managing muck accumulation from leaves. I don’t think I can keep all leaves out so I am anticipating recurring maintenance of muck. I got an aerator in and working, now for beneficial bacteria. I understand the principle involved, but don’t understand some practical issues. First, shouldn’t there be a natural population of aerobic bacteria that would rise to the occasion of more organic matter to feed on? Second, if I greatly boost that population with a treatment to reduce sludge, why doesn’t it thrive on the “food” until it is all gone rather than needing to retreat every couple weeks. What happens to the aerobic bacteria population in that two weeks?

Very good questions. I am also interested in understanding this.

A couple months ago in Pond Boss mag, there were articles with competing points of view on bacteria supplements.

I know very little about bacteria function for pond muck - so this may be worth less than "my two cents". However, the math for population doubling is incredible. If the process is viable, the population will literally explode. It will then typically run up against some fatal limit. Sometimes that is food supply, but it can be waste removal, some trace chemical requirement, etc. That can lead to an inevitable boom and bust cycle that you need to manage for your best results.

The advantage of your smaller pond is that you may be able to more readily measure your results. If the experiment is within your budget, then perhaps try it and modify for the next round if you think you can optimize for the unique conditions in your pond.

Good luck on your pond project. I do love a good little woodland pond, since most of the ponds in my area are in open, wind-swept ground.

A hidden requirement makes sense, but that would mean a new dose would need to bring that requirement along with more bacteria. That would be an interesting marketing ploy, but would be exposed by some knowledgeable enthusiast. I ran across an interesting post about taking part of a prepared bacteria culture and using it to grow additional “soup”. It wasn’t talking about pond control, more about probiotic uses in agriculture, and it sounded a lot like a brewing process.

As long as you are not killing the bacterial community in the pond with chemical applications, there should always be good diversity of high populations of natural aerobic bacteria in the pond as long as the zone of decomposition is highly oxygenated. Keeping the zone of decomposition remaining well oxygenated is the main problem and the main limiting factor. Pond aerators move water across the bottom surface and no oxygenated currents move below the top sedimented surface layer.

Problem with sedimented layers of tree leaf material on the pond bottom is the subsurface leaf layers are like pages of a book and the lower layer relatively quickly becomes anaerobic unless the organic accumulations are regularly stirred, mixed or agitated. Mixing frequency is variable and depends on numerous factors. Not all tree leaves decompose at the same rate; some species decompose slow, some quickly. Keeping the organic layer of leaves mixed significantly speeds the decomposition rate of all organics for both terrestrial and aquatic habitats. Even backyard or commercial organic compost piles need to be regularly turned / mixed for fastest decomp. Best policy IMO is remove as many floating leaves as possible before they sink. Second best policy is do not build a pond in wooded areas if tree leaf accumulations are a concern.

All makes good sense. Does this describe the situation accurately:

Accumulated layered mixture of leafy residues and decomposing muck is being slowly acted on by natural anaerobic bacteria within the muck structure and minimum aerobic bacteria due to low oxygen at the surface layer of that structure.

Added oxygen from aeration improves muck upper layer oxygen but impact is slowed by layered structure inhibiting oxygen transport to bulk of muck structure

Addition of artificially high aerobic bacteria treatment may speed up the upper layer decomposition but available digestible organic material is still limited by layered non digestible leafy residue, resulting in premature die off of added bacteria count.

If new leaf residue is sufficiently restricted so that the combined effect of subsurface anaerobic and muck surface aerobic (aided by aeration and yearly treatment), the pond may eventually clear.

Addition of muck layer disruption should speed up the whole process as well as extend the useful life of each periodic treatment. (Although at the cost of locally muddy water as the stirred material resettles).



As for restricting leaf residue, I am hoping that aeration surface flow along with air movement from a leaf blower will move leaf debris towards the pond edges where it can be netted with hand net or sein during peak leaf fall.

I am a big believer of: an ounce of prevention is worth a pound of cure.

We have a big area of tallgrass prairie on our property. The varying height and density of the multiple grass species is essentially a 100% effective leaf trap.

Do you have room to plant some tallgrass prairie sections around your pond without ruining the look? You would need to mow a path in some areas for access for humans, pets, wildlife, etc., but that would stop a bunch of leaf debris from entering your pond.

Also, my wildlife LOVES the cover. The quail, turkey, pheasants, deer, and (darn) coyotes all travel in the mowed/burn sections right next to the tall grass. When spooked, they just fade into the deep cover.

The pond is a converted bog in the middle of a larger 3/4 acre wetlands near a ridge between two watersheds. It is in the middle of 4 acres of maturing forest. The wetlands is natural with high grasses and sedges. That catches most runoff and some leaves, but the nearby tree canopy is very high and most leaves are carried by the wind into the pond. It’s beautiful but will require some maintenance

For the age, historical origin, location and surroundings of this pond Nature is demanding the pond return to the bog lifestyle. Battling Nature's continual forces will be definitely a BIG challenge. I would consider building a new pond that had minimal or no tree leaf inputs in your capital appropriations budget.

Sometimes you just have to dance with "the one that brung ya"!