Balcony Aquaponics System

I am treating this as a compact systems-planning problem: keep water moving, separate solids before they reach the biological stage, make failure paths visible, and leave enough access to inspect and maintain the system. The public draft uses two planned tanks, tiered plant zones, two main racks and one auxiliary rack as design inputs, not as proof that equipment has been bought or installed.

The page is deliberately generalized. Exact balcony, wall, walkway, outlet, rack and tank measurements stay out of the public draft until they have been reviewed for privacy and feasibility. The diagrams explain relationships, while the planning ledger keeps candidate sizes and unresolved decisions visible.

The proposed loop sends water from the tank pair through solids-lifting overflows, a mechanical filter and a moving-bed biofilter into a sump. A DC return pump and manifold then send water to generalized plant zones before it returns to the tanks.

This is a communication diagram, not a hydraulic model. It does not establish turnover, pump head, drain capacity, biological maturity or structural adequacy. Those checks belong to the build review.

The planning brief separates normal water flow from captured solids and from an emergency dry-drain path. The proposed sequence is a shared header, radial-flow filter, moving-bed biofilter and sump, with a service point for solids handling rather than a hidden maintenance step.

The displayed pipe sizes are candidate planning inputs. Overflow sizing, receiving capacity, drain slope, pump failure behavior and the route to a safe discharge point remain unresolved.

The rack drawing uses relative lower, middle and upper tiers so the public page can discuss plant placement and service access without publishing a precise home layout. Lower zones are intended for leafy herbs, while upper zones are reserved for larger herbs or bushes in the current concept.

Filled tanks, filters and wet media create a real structural and stability problem. Rack loading, floor loading, tip resistance, fasteners, wall conditions and access or egress require site-specific validation before construction.

The proposed return manifold has six half-inch feeds for plant zones and two three-quarter-inch returns toward the tanks. Valves, unions, check valves and isolation points are shown as planning needs because a readable manifold is easier to test and service than a single opaque branch.

The count and candidate sizes are not a hydraulic design. Final pipe sizing, head loss, flow balance, endpoint elevations and pump selection must be checked together, including what happens when one branch is closed or a pump stops.

Safety planning includes GFCI protection, drip-loop review, leak sensors, battery-backed aeration, a spare pump and visible dry-drain paths. The intent is to make loss of power, loss of return flow and a leak observable and recoverable rather than relying on one component to work forever.

The current air target is roughly 40 to 60 liters per minute, with battery runtime still to be determined. Electrical protection, enclosure placement, water exposure, emergency shutoff access and maintenance procedures remain open review items.

The candidate livestock list includes kuhli loaches, pygmy Corydoras, bristlenose pleco, Neocaridina, dwarf crayfish and mystery snails because those animals came up in planning conversations. The list is not a compatibility result. Temperature, adult size, behavior, bioload, plant damage, water chemistry, disease control and welfare need a separate review before any stocking decision.

The useful outcome of this draft is a bounded set of questions: can the support structure carry the filled system, can normal and emergency paths handle credible flow, can wet electrical equipment be protected, can every filter and shutoff be reached, and can the planned livestock coexist? Until those answers are supported, the system remains a proposal.