Frequently Asked Questions

For standard catalog items, our MOQ is typically 50-100 pieces per model. For custom sizes, materials or OEM orders, the MOQ may be higher. Please contact us with your specific requirements for a precise quote.

Yes, we specialize in OEM and custom drainage solutions. We can customize sizes, materials (SUS304/316L), grate designs, outlet types, and surface finishes. Our engineering team supports custom drawings and provides technical assistance for your project.

Consider these key factors: application area (residential bathroom, commercial kitchen, industrial facility), expected load class, flow rate requirements, material compatibility, and installation depth. Our engineers can help recommend the right solution based on your drawings or specifications.

Our products are CE certified, ISO 9001:2015 quality management certified, and many models carry WaterMark certification. Stainless steel products comply with EN 1253 and GB/T standards. Test reports are available upon request.

We offer stainless steel (SUS304 for residential/commercial use, SUS316L for coastal and heavy industrial environments) and HDPE (high-density polyethylene) for light-duty to medium-duty applications such as gardens, courtyards and commercial landscapes.

We provide a 5-year warranty on stainless steel drainage products against manufacturing defects. HDPE products carry a 3-year warranty. The warranty covers material and workmanship issues under proper installation and normal use.

Yes, our product catalogs and 2D/3D CAD drawings are available for download on each product page. Detailed installation manuals and test certificates can also be provided on request.

Standard products ship within 7-15 business days. Custom or OEM orders typically require 25-35 days for production plus shipping time. Express production is available for urgent projects — please contact us to discuss.

Yes, we ship worldwide. We work with reliable freight forwarders for sea freight (FCL/LCL), air freight, and express courier (DHL/FedEx/UPS). We can handle both EXW and FOB trade terms.

For standard orders, we accept T/T (30% deposit, 70% before shipment). For established partners, L/C at sight is available. We also support Alibaba Trade Assurance for secure transactions.

A trench drain (also called a linear drain or drainage channel) is a long, narrow channel that collects water along a line and moves it to a single outlet; it is the right choice for showers, walk-in areas and industrial floors where water spreads across a large surface. A point drain is a compact floor drain that collects water at one location, best for small spaces such as laundry rooms or toilets. As a rule of thumb, use a trench drain when the floor area is larger than about 6 m² or when you need a floor fall in one direction, and use a point drain for small wet zones. Superdrain offers both stainless steel and HDPE drainage channel options. Suditek engineering team notes: for any wet zone over about 6 m², a trench drain cuts installation time and reduces the number of traps to maintain.

A floor drain water seal of at least 50 mm is recommended for residential and commercial buildings, matching the requirement of EN 1253 for floor drains. The water seal is the standing water inside the trap that blocks sewer gases, odours and insects from rising through the drain. If the seal is less than 50 mm, it can be pulled out by siphoning or evaporation and smells will enter the room. Choose a drain with a deep trap (50 mm or more) in bathrooms, kitchens and laundry rooms, and pour water into rarely used drains every few weeks to keep the seal topped up. Suditek engineering team notes: drains with a 50 mm seal satisfy EN 1253 type testing, and topping up rarely used traps every 2-4 weeks prevents dry-seal odours.

Load classes follow EN 1253-1 for floor drains and EN 1433 for drainage channels. A15 (15 kN) suits pedestrian areas, balconies and bathrooms; B125 (125 kN) suits car parks and light vehicle traffic; C250 (250 kN) suits heavy vehicles, workshop entrances and industrial floors; D400 (400 kN) suits roadways and truck areas. For a typical residential shower use A15. For a garage or driveway select B125. For forklift or truck traffic in a factory or car wash, choose C250 or D400 with a stainless steel grate to avoid crushing. Suditek engineering team notes: when in doubt between two load classes, choose the higher one — a C250 channel also tolerates point loads from pallet jacks better than A15.

Choose the material by load, environment and budget. Stainless steel (SUS304 for residential and commercial, SUS316L for coastal or chemical environments) gives the longest service life, supports high loads with metal grates, and is easy to clean — best for kitchens, food plants and industrial floors. HDPE (high-density polyethylene) is lightweight, corrosion-proof and low cost, ideal for gardens, courtyards and light commercial areas without heavy loads. Polymer concrete resists chemicals and carries higher loads than HDPE but is heavier and harder to modify on site. For a 10-year cost comparison, stainless steel usually wins when cleaning time and replacement are counted. Suditek engineering team notes: for food plants and coastal projects we default to SUS316L; for dry exterior landscaping, HDPE keeps the project within budget without sacrificing chemical resistance.

A floor fall of 1:50 (2%) toward the trench drain or floor drain is the widely used minimum, meaning the floor drops 20 mm for every 1000 mm of distance. Within the drainage channel itself, a slope of 1:100 to 1:50 is typical. A steeper slope drains faster but can be uncomfortable to walk on in showers; a gentler slope risks standing water. Grout, adhesive and surface tiles should be screeded to the fall before the drain is set. Superdrain channels can be installed in a continuous run with a factory or on-site slope to suit the project drawing. Suditek engineering team notes: for long runs over 6 m, split the channel into two falls toward a central outlet instead of steepening the slope beyond 1:50.

Most shower drain blockages come from hair accumulating inside the drain pipe. Stop them with three measures: choose a shower drain with a removable hair catcher or basket under the grate; use a grate with slots narrow enough (around 8 mm or less) to trap hair while passing water; and clean the basket weekly in high-use showers. For linear shower drains, a 50 mm water seal still blocks odours while the hair catcher does the mechanical work. If a blockage does form, remove the grate and catcher and clear the trap by hand or with a drain snake — do not pour caustic chemicals that can damage stainless steel finishes. Suditek engineering team notes: pairing a grate slot of 8 mm or less with a removable basket removes most clog complaints — cleaning the basket weekly is the single most effective maintenance step.

EN 1253 is the European standard for floor drains and gratings in buildings. CE certification to EN 1253 confirms that a floor drain meets tested requirements for water tightness, load resistance, water seal retention and hydraulic flow. In practice it means the drain has passed type testing for classes such as A15 or B125, that the water seal depth is verified, and that the product is safe to use in European construction. Superdrain stainless steel floor drains are CE certified under EN 1253, and test reports can be provided for project documentation and compliance reviews. Suditek engineering team notes: EN 1253 type tests cover water tightness, load, seal retention and hydraulic flow — ask our team for the test report before your compliance review.

Anti-slip grates use surface patterns such as raised ribs or studs to reduce the risk of slipping when the floor is wet. The relevant European classification is R11, tested under DIN 51130 with an inclined plane; R11 is generally recommended for wet and constantly damp areas such as showers, commercial kitchens and pool decks. For stainless steel grate bars, options include V-grooved profiles and knurled surfaces that increase friction without trapping dirt. When selecting a grate for public or commercial wet areas, pair an R11 grate with a load class that matches traffic (A15 for foot traffic) and confirm the pattern direction matches the walkway. Suditek engineering team notes: pairing an R11 grate with a matching load class is the standard specification for commercial wet areas such as kitchens, pool decks and shower rooms.

Yes — a zero-threshold linear drain lets you build a barrier-free shower with no step and no door sill. The channel body is set flush with the finished floor, the grate sits at floor level, and a 50 mm water seal (EN 1253) keeps odours out while the floor falls 1:50 toward the channel. Use an A15-rated channel for residential shower areas and confirm the tile-insert grate pattern with your tiler before screeding. Suditek engineering team notes: order the channel body and grate together with the waterproofing membrane spec so the membrane laps over the flange — this single detail prevents most zero-threshold leaks.

Standard stainless steel drains are supplied with a brushed finish (240 grit), which hides water marks and cleans well in bathrooms and kitchens; mirror-polished and other custom finishes are available on request. SUS304 is the default grade for residential and commercial use, and SUS316L is specified for coastal, pool and industrial environments where chlorides attack lower grades. The finish is applied after welding and passivation, so the whole body — not just the visible grate — carries the same protection. Suditek engineering team notes: specify the finish in your RFQ because the same model can be supplied brushed or polished without changing the drain dimensions or load class.