I. Core logic of filtration system selection‌

‌Formulaic Decision Modeling::

‌Benchmarks for key parameters for 30m³ fish ponds::

• ‌Koi density cordon: Adult fish ≤ 5 fish/m³ (high density culture requires upgrading of 30% filtration capacity)
• ‌daily quantity of sewage: 2%-3% of baiting is converted to manure (20-30L of solid waste to be processed based on 1kg daily feeding)
• ‌Nitrification system carrying capacity: 0.5g ammonia/day per 100L of filter media treatment (refer to Japan Koi Association standards)

‌Second, the four major filtration systems horizontal evaluation‌

‌Recommended combinations::

• ‌Economical and practical: Overflow filtration (primary) + drip tank (secondary) ≈ 32,000 yen
• ‌Balanced quality: Stainless steel filtration + UV sterilization ≈ 55,000 yen
• ‌Ecological landscape type: Front sand tank + swamp filtration ≈ $48,000

‌III. Golden Rule of Filter Unit Configuration‌

1. ‌Physical filtration area (30% of system volume)‌

   • ‌Brush density: 30 brushes/m³ water (recommended 150mm diameter PP brush)
   • ‌Magic Carpet Layers:: 3-ply removable (1 high-pressure water jet rinse per week)
   • ‌Diameter of drain valve: ≥110mm (to avoid clogging during the rainy season)

2. ‌Biochemical filtration zone (50% of system volume)‌

   • ‌Filter Material Ratio::
     • Volcanic Stone: K1 Filter Media: Bacteria House = 3:5:2
     • Total weight ≥ 800kg (to meet the nitrification needs of 30m³ water body)
   • ‌water velocity: ≤0.3m/s (to guarantee bacterial film attachment)

3. ‌Sterilization module (10% of system volume)‌

   • ‌UV Lamp Selection::
     • Power = volume of water body (m³) × 0.8W (24W for 30m³)
     • Quartz sleeve life ≥ 8000 hours
   • ‌Ozone machine linkage: Set ORP value 350mV auto start/stop

‌Fourth, the pump selection calculation secret‌

1. ‌Flow rate formulas::

   textCopy Code
   Theoretical flow rate (m³/h) = volume of water body ÷ 2 (circulation cycle ≤ 2 hours)

   • 30m³ pool theoretical need 15m³/h, actual selection × 1.5 times the margin ⇒22.5m³/h‌

2. ‌Lift Compensation::

   • For each additional meter of pipe loss, the actual flow rate decreases 8%-10%
   • Recommended Model.Tsurumi TSP-25000(25m³/h, head 5m, power consumption ≤180W)

3. ‌Energy Saving Tips::

   • Split-time operation: 1001 TP3T power during the day, 701 TP3T power at night
   • Linkage dissolved oxygen meter: automatically boost 20% flow when DO<4mg/L

‌V. Special rainy season retrofit program‌

1. ‌Anti-backflow structure‌

   • Add 15cm water barrier at the top of the filter bin.
   • Additional check valve for drain pipe (Recommended model.)Submarine DG50)

2. ‌Emergency biochemical kit‌

   • Suspended Nitrifying Bacteria Carrier (Porous Ceramic Balls + EM Bacteria Lyophilized Powder)
   • Pre-storm input: 500g/10m³ water body

3. ‌Dissolved Oxygen Compensation System‌

   • Venturi injector (connected to main water pipe, oxygenation efficiency ≥3gO₂/kWh)
   • Alternative: nano aeration pipe (placed 30cm below the bottom of the pool)

‌VI. Core strategies for cost control‌

1. ‌Pipe DIY‌

   • PVC-U water supply pipe (DN75) for main water pipe, saving 60% over stainless steel pipe
   • Replace 90° right angle at elbow with 45° angled tee to reduce 10% water resistance

2. ‌Filter Media Alternate Program‌

   • Bacteria house → Red brick fragments (cracked into 3cm particles, acid washed for use)
   • Activated carbon → bamboo charcoal barbecue charcoal (200 mesh sieve washing, activated by exposure to sunlight)

3. ‌Intelligent Operation and Maintenance System‌

   • IoT water quality monitor (four parameters pH/ORP/DO/TDS)
   • Annual maintenance cost: electricity cost about 800 yuan, filter loss about 300 yuan

‌VII. Classic Design Cases‌

‌Suzhou a villa area 30m³ fish pond installed program‌

• ‌Configuration list::
  • Main filtration: 3-bin overflow (physical + biochemical + clear water)
  • Auxiliary filtration: sand tank (800mm diameter) + drip tower (6 layers)
  • Water pump: Rainbow MP-800 (24m³/h with frequency control)
• ‌Operational data::
  • Ammonia ≤ 0.1mg/L, Nitrite ≤ 0.05mg/L
  • Annual water exchange <10%, electricity cost 0.35 yuan/m³/day

‌VIII. A guide for novices to avoid pitfalls‌

1. ‌Flow ≠ headA fish enthusiast mistakenly chose a high-head pump, causing the water to hit the koi and rot their fins.
2. ‌Over-cleaning of filter media: Flushing the bacteria house with tap water caused the nitrification system to collapse
3. ‌UV lamp direct: Failure to install shields leads to increased algal resistance
4. ‌Swamp Filter Abuse: Use of aquatic plant filtration in rainy areas triggers parasite outbreaks

‌Final Recommendations‌
       Print this form and post it in the equipment room:

        Selecting a filtration system is like building an "underwater mansion" for koi, not only do you need to calculate cold data, but you also need to understand the joy of the fish when they are waving their tails. Scientific planning + flexibility is the only way to achieve a pool of blue water.