Yamato WA301B Auto Pure Lab Water Polishing System
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The Yamato Auto Pure WA301B is a high-flow benchtop water polishing system that produces ASTM Type 1 ultrapure water from pre-treated feed water (RO, DI, or distilled). Designed for high-throughput laboratory environments, the WA301B delivers 2.5 L/min continuous flow at 18.2 MΩ·cm resistivity with TOC <15 ppb and bacteria <1 cfu/ml — meeting the most demanding analytical and biological purity requirements.
Key Features:
- 🇺🇸 Designed and manufactured in the USA — domestic support, parts, and service availability
- 2.5 L/min continuous flow — highest output in the Yamato water purification lineup
- 18.2 MΩ·cm resistivity — ASTM Type 1 / CLSI Type 1 ultrapure water
- TOC <15 ppb and bacteria <1 cfu/ml for sensitive biological and analytical applications
- 0.2µm final membrane filter for particle and bacteria removal
- Resistivity meter with digital display and low-purity alarm
- UV lamp for TOC reduction and bacteria control (optional accessory)
- Compact polishing-only design — connects to existing RO/DI or distilled water supply
- 120V / 220V operation
Important: The WA301B is a water polishing system — it requires pre-treated feed water (<20 µS/cm conductivity). It is not a standalone purifier and cannot process standard tap water directly.
✓ Ships directly from Yamato USA (Santa Clara, CA)
✓ Orders typically process and ship within 3–5 business days
✓ Includes Yamato's full 1-year manufacturer warranty
✓ Proudly manufactured in the USA — domestic parts and service support
✓ 7-day price match guarantee from date of purchase
✓ Alaska, Hawaii, and international shipping available — contact us for rates
The Yamato Auto Pure WA301B is a high-flow benchtop water polishing system that produces ASTM Type 1 ultrapure water from pre-treated feed water (RO, DI, or distilled). Designed for high-throughput laboratory environments, the WA301B delivers 2.5 L/min continuous flow at 18.2 MΩ·cm resistivity with TOC <15 ppb and bacteria <1 cfu/ml — meeting the most demanding analytical and biological purity requirements.
Key Features:
- 🇺🇸 Designed and manufactured in the USA — domestic support, parts, and service availability
- 2.5 L/min continuous flow — highest output in the Yamato water purification lineup
- 18.2 MΩ·cm resistivity — ASTM Type 1 / CLSI Type 1 ultrapure water
- TOC <15 ppb and bacteria <1 cfu/ml for sensitive biological and analytical applications
- 0.2µm final membrane filter for particle and bacteria removal
- Resistivity meter with digital display and low-purity alarm
- UV lamp for TOC reduction and bacteria control (optional accessory)
- Compact polishing-only design — connects to existing RO/DI or distilled water supply
- 120V / 220V operation
Important: The WA301B is a water polishing system — it requires pre-treated feed water (<20 µS/cm conductivity). It is not a standalone purifier and cannot process standard tap water directly.
✓ Ships directly from Yamato USA (Santa Clara, CA)
✓ Orders typically process and ship within 3–5 business days
✓ Includes Yamato's full 1-year manufacturer warranty
✓ Proudly manufactured in the USA — domestic parts and service support
✓ 7-day price match guarantee from date of purchase
✓ Alaska, Hawaii, and international shipping available — contact us for rates
Technical Specifications / Comparison
| Model | WE200 | WG205-115V / 220V | WA301B | WA311B |
| Series | Pure Line | Auto Still | Auto Pure | Auto Pure |
| Purification Method | RO membrane → Ion exchange → Filtration | Ion exchange → Distillation | Ion exchange → Filtration (polishing) | Ion exchange → Filtration (polishing) |
| Purified Water Type | Deionized (Type 1 / A4) | Deionized (Type 1) + Distilled (Type 2) | Deionized (Type 1) | Deionized (Type 1) |
| Resistivity | Up to 18.2 MΩ·cm | 5-stage conductivity LED | 18.2 MΩ·cm | 18.2 MΩ·cm |
| TOC | <50 µg/L | — | <15 ppb | <15 ppb |
| Bacteria | — | — | <1 cfu/ml | <1 cfu/ml |
| Flow Rate | 0.5–1.0 L/min | ~1.5 L/h (distilled) / ~1.0 L/min (DI) | 2.5 L/min | 2.5 L/min |
| Feed Water | Standard tap water | Standard tap water | Pre-treated only (<20 µS/cm) | Pre-treated only (<20 µS/cm) |
| Tank | None — continuous flow | 20L polyethylene tank | None — continuous flow | None — continuous flow |
| Final Filtration | 0.1µm membrane filter | Optional membrane filter | 0.2µm filter | 0.2µm filter |
| Power Source | 100–240VAC (universal) | 115V or 220V (external transformer) | 120V, 60Hz, 1.0A | 220V, 50Hz, 0.5A |
| Dimensions | W350 × D430 × H470 mm | W540 × D575 × H775 mm | 54.8 × 37 × 36.5 cm | 54.8 × 37 × 36.5 cm |
| Weight | ~30 kg | ~55 kg | 42 lbs dry / 47 lbs operating | 42 lbs dry / 47 lbs operating |
| Country of Origin | Japan | Japan | USA | USA |
| Price | $5,010 | $7,355 | $11,520 | $11,520 |
* The WE200 and WG205 connect directly to standard tap water. The WA301B and WA311B are polishing systems and require pre-treated feed water (RO/DI or distilled, <20 µS/cm) — they are not standalone purifiers.
WA301B Consumable Parts (Sold Separately):
- Ion-exchange resin cartridge (#WA301-RESIN)
- 0.2µm membrane filter (#WA301-MF)
- UV lamp (#WA301-UV) — optional, for TOC reduction
Note: Feed water must be pre-treated to <20 µS/cm conductivity before use. Connecting tap water directly will damage the ion-exchange resin and void the warranty.
Applications
The WA301B is designed for laboratories that already have an RO or DI water supply and need a high-flow polishing system to achieve ASTM Type 1 purity at the point of use:
High-Sensitivity Trace Analysis
ICP-MS, ICP-OES, HPLC, and atomic absorption spectroscopy require ultrapure water to prevent background contamination. The WA301B's 18.2 MΩ·cm resistivity and <15 ppb TOC meet ASTM Type 1 requirements for these applications at 2.5 L/min — ideal for high-throughput analytical labs.
Cell Culture and Biological Applications
With bacteria <1 cfu/ml and TOC <15 ppb, the WA301B produces water suitable for cell culture media, buffer preparation, and bioreactor rinsing. For pyrogen/endotoxin-free requirements (<0.001 EU/ml), an optional downstream ultrafiltration (UF) cartridge is recommended.
Buffers and Reagents
High-purity buffer and reagent preparation requires water free from ions, organics, and particulates. The WA301B's polishing process delivers consistent Type 1 water for pH-sensitive and trace-level analytical work.
General High-Purity Laboratory Use
Suitable for any application requiring consistent ASTM Type 1 water output at high flow rates — including glassware rinsing, standard solution preparation, and instrument feed water.
