EasyPro EM1621FB Pro-Series 16' x 21' Pond Kit – Complete Koi Ecosystem System with Skimmer, BioFalls & Pump

The EasyPro EM1621FB Pro-Series 16' × 21' Pond Kit is a complete, pre-matched ecosystem pond system for a 3,800-gallon koi pond or water garden. Every component is selected and sized to work together: the TH400 5,100 GPH waterfall pump drives the PS1FB Pro-Series Skimmer and feeds the AM Medium AquaFalls™ biological waterfall filter — all connected by 50 feet of 2" flexible PVC. The Firestone 45-mil EPDM liner and underlayment, LED lighting kit, beneficial bacteria starter, and full installation kit are included. No spec matching, no guesswork, no missing pieces. EasyPro's Pro-Series pond kits are manufactured in the USA and are used by professional pond installers and DIY homeowners nationwide. The TH400 pump is one of the most widely installed pond pumps in North America, and the AM AquaFalls is a workhorse biological filter with a 26-inch waterfall opening — wide enough for a dramatic waterfall feature and engineered for buried, fully concealed installation. 16' × 21' Pond 3,800 Gallons TH400 — 5,100 GPH AM AquaFalls — 26" Opening PS1FB Pro Skimmer 20'×25' Firestone 45-mil EPDM EasyPro Pro-Series Freight Shipped Complete Component List — EasyPro EM1621FB Liner System 20'×25' Firestone 45-mil EPDM fish-safe liner Protective geotextile underlayment Liner patch (in installation kit) Filtration AM Medium AquaFalls™ Pro-Series biological waterfall filter — 26" opening, 6,000-gal capacity 3 filter pads + 3 mesh media bags included PS1FB Pro-Series Skimmer — 8" weir, 6,000 GPH, filter brushes + mesh net Pump & Plumbing TH400 — 5,100 GPH, ½ HP, 115V, 20' cord, 2-year warranty 2" × 50' flexible kink-free PVC pipe Check valve assembly Lighting LED2K — 3 mini LED spotlights 45-watt transformer Water Quality Beneficial bacteria starter Installation Kit PVC primer + glue Black foam sealant (AquaFalls lip) Silicone sealant Liner patch Instruction guide Nothing left to buy: Liner, underlayment, skimmer, biological filter, pump, 50' PVC, check valve, LED lighting kit, bacteria, foam, glue, and instructions are all in the box. Rocks, gravel, and aquatic plants are not included — source locally for your decorative finish. Technical Specifications Component Specification Kit SKU EM1621FB Pond Size 16' × 21' (up to 2' deep) Pond Volume 3,800 gallons (at standard 2' excavation depth) Pump: TH400 5,100 GPH max flow | ½ HP | 115V | 3.7–6.0A | 36' max head | 2" outlet | 20' cord | 2-year warranty Pump Motor Housing 304 stainless steel | fiber-reinforced casing | vortex impeller | thermal overload protection Waterfall Filter: AM AquaFalls™ 26" waterfall opening | 6,000-gal pond capacity | 7,200 GPH max | tub 35"L×36"W×28"H | upflow design | buried installation AquaFalls Included Contents Tub, faux rock lip, stainless steel hardware, 3 filter pads, support stand, 3 mesh media bags, 2× 2" bulkhead fittings, 2" PVC plug, black silicone Skimmer: PS1FB 8" weir | 6,000 GPH max | 28"L×18"W×20"H | skims 600 sq ft | filter brushes + mesh net | two-chamber roto-molded Liner 20'×25' Firestone 45-mil EPDM — fish-safe, UV-resistant, ozone-resistant, flexible to −40°F PVC Pipe 2" × 50' flexible kink-free PVC Lighting LED2K — 3 mini LED spotlights + 45-watt transformer Voltage 115V (230V pump available — TH4002, order separately) Kit Weight 370 lbs Shipping LTL freight — contact for freight details EasyPro Pro-Series Pond Kit Lineup 6' × 6' ~300 gal ES66FB 11' × 16' ~1,500 gal EM1116FB 16' × 16' ~2,700 gal EM1616FB 16' × 21' ← 3,800 gal EM1621FB (this kit) Why the EasyPro EM1621FB Pro-Series Kit? TH400 — one of the most widely installed pond pumps in North America. The stainless steel TH Series pump has field-proven reliability across thousands of installations. The vortex impeller design prevents debris clogging, automatic thermal overload protection guards against burnout, and the air-filled continuous duty motor is designed for years of 24/7 operation. With 5,100 GPH at max flow, it drives the AM AquaFalls and PS1FB skimmer with plenty of head pressure to spare at typical installation heights. AM Medium AquaFalls — buried, concealed, 26" waterfall opening. Unlike above-ground waterfall filters that must be hidden with foam and rocks, the AquaFalls is designed to be buried flush with ground level. The faux rock lip bolts directly to the tub — no foaming required. Water flows upward through three filter pads and mesh media bags in an upflow design that maximizes contact time with biological media. The 26" waterfall opening creates a wide, natural-looking falls over the rock lip. PS1FB two-chamber skimmer with filter brushes. The removable center divider creates two separate chambers — one for mechanical filtration (brushes + mesh net) and one for the pump. This design means you can pull the pump for inspection without disturbing the brush media, and clean the brushes without moving the pump. The extended intake flange allows rocks to be stacked above and beside the skimmer opening for a completely natural-looking concealment. Firestone 45-mil EPDM liner — fish-safe, cold-weather rated. The 20'×25' Firestone liner provides generous overlap beyond the 16'×21' pond footprint for proper edging. At 45 mil thickness, it's flexible to −40°F and highly resistant to UV degradation and ozone. Fish-safe formulation contains no plasticizers harmful to koi or goldfish. LED2K lighting extends pond enjoyment into evening. Three mini LED spotlights with a 45-watt transformer illuminate the waterfall and pond at night. The kit is positioned at installation for the best viewing angles during the build, before rocks are set in place. Beneficial bacteria starter included. A bacteria supplement is included to seed the AM AquaFalls filter media and establish the biological filtration cycle from day one. Adding bacteria weekly after startup maintains the biological load as fish are introduced. Frequently Asked Questions What is included in the EasyPro EM1621FB kit? The EM1621FB includes: 20'×25' Firestone 45-mil EPDM liner, protective underlayment, PS1FB Pro-Series Skimmer (8" weir, 6,000 GPH), AM Medium AquaFalls™ Pro-Series waterfall filter (26" opening, 6,000-gal capacity), TH400 submersible pump (5,100 GPH, ½ HP, 2-year warranty), 2"×50' flexible PVC pipe, check valve assembly, LED2K (3 mini LED lights + 45-watt transformer), beneficial bacteria starter, and installation kit (PVC primer, glue, liner patch, silicone, black foam). Rocks, gravel, and aquatic plants are not included. How many gallons does the 16'×21' pond hold? When excavated to a standard depth of 2 feet with typical shelving, the 16'×21' EasyPro pond holds approximately 3,800 gallons. This volume provides excellent thermal stability for koi through seasonal temperature swings and supports a healthy fish load with the AM AquaFalls and PS1FB filtration combination. For maximum koi health, excavating at least one section to 3 feet provides additional thermal buffer in cold winters. What are the TH400 pump's electrical specs and cord length? The TH400 specifications: 5,100 GPH max flow, ½ HP, 115V, 3.7–6.0 amps, 36' maximum head, 2" female threaded outlet, 20' power cord (standard), 2-year limited warranty. The pump requires a properly grounded GFCI-protected outlet. If your skimmer is more than 20 feet from your electrical outlet, EasyPro offers 50' and 100' cord versions (TH400-50 and TH400-100) — contact us at (765) 508-4352 to order the correct cord length before your kit ships. A 230V version (TH4002) is also available. All cord options carry the same 2-year warranty. How does the AM AquaFalls filter work, and why is it buried? The AM Medium AquaFalls™ is an upflow biological waterfall filter: pond water enters through one of two 2" inlet bulkheads on the sides of the tub, flows upward through three filter pads and mesh media bags (which trap suspended debris and support beneficial bacteria colonies), then cascades over the 26" faux rock lip and back into the pond as a waterfall. The filter is designed to be buried flush with the ground, leaving only the faux rock lip and waterfall opening visible. The sidewalls are roto-molded for structural rigidity under soil pressure. This buried design allows the filter to be completely concealed with natural rock work — unlike above-ground filters that require extensive foam and stone camouflage. Why does the PS1FB skimmer use filter brushes instead of a mat? The PS1FB ships configured with filter brushes, which are highly effective for mechanical pre-filtration in a 16'×21' pond. Brushes trap leaves, grass clippings, and coarse debris while maintaining consistent water flow to the pump — they don't compress or clog under debris load the way a single flat filter pad can. The two-chamber design means brushes and mesh net sit in the filtration chamber while the pump occupies the separate pump chamber, so you can service the brushes without disturbing the pump. The PS1FB can also be configured with a vertical filter mat if preferred — EasyPro designed it for both media types. Can this kit support a heavy koi load? Yes, the EM1621FB is designed as a koi ecosystem. The PS1FB + AM AquaFalls combination handles the biological load of a moderately stocked koi pond in a 3,800-gallon system. For maximum koi health: excavate one zone to 3 feet for thermal protection, add beneficial bacteria weekly to establish and maintain the biological filtration cycle in the AquaFalls media, avoid overstocking in the first season while the filter matures, and consider an optional bottom drain or aeration system for heavy koi loads exceeding one 10" fish per 100 gallons. What are the electrical requirements for this kit? The TH400 pump requires a standard 115V, GFCI-protected outlet rated for the pump's 3.7–6.0 amp draw (startup amperage is higher — ensure your circuit can handle the load). The LED2K transformer is 45 watts at 115V. Both run on the same household current. Locate your GFCI outlet at least 6–10 feet from the pond edge per NEC guidelines for outdoor water features. If your installation requires a 230V pump, the TH4002 230V version is available separately. Does this kit ship freight, and what does that involve? Yes — the EM1621FB ships LTL (Less than Truckload) freight due to the size and weight of the liner and components (approximately 370 lbs). After your order ships, the freight carrier will contact you to schedule a delivery appointment. An adult must be present to inspect and sign for the shipment. Inspect all components before signing — note any visible shipping damage on the delivery receipt. Questions about freight delivery options? Call or text us: (765) 508-4352, Monday–Friday, 9 AM–5 PM EST. Why Buy From Pond Pro Direct? Authorized EasyPro dealer — full manufacturer warranty on all components, including the TH400 2-year pump warranty. Full EasyPro Pro-Series pond kit lineup — from 6'×6' starter kits to 24'×24' large kits. Call us to compare sizes: (765) 508-4352. Expert installation guidance — our team can walk you through excavation planning, component positioning, and startup before your kit arrives. Price Match Guarantee — found a lower authorized dealer price? We'll beat it by $50 on orders over $2,000. 30-Day Return Period. Call or text (765) 508-4352, Monday–Friday, 9 AM–5 PM EST. The EasyPro EM1621FB delivers a complete 3,800-gallon koi pond ecosystem: TH400 5,100 GPH pump, AM AquaFalls 26" waterfall filter, PS1FB skimmer, 20'×25' Firestone 45-mil liner, 50' PVC, LED2K lights, beneficial bacteria, and a full installation kit — everything matched and tested to work together, backed by EasyPro's 2-year pump warranty. Freight shipped. Comparing the 16'×21' to the 16'×16', or planning a larger install? Call or text (765) 508-4352 — Monday through Friday, 9 AM to 5 PM EST.