1. Introduction
This manual provides essential information for the installation, operation, maintenance, and troubleshooting of your BLANCO DIAMOND 50/50 Double Bowl Kitchen Sink, Model 441285. Please read these instructions carefully before beginning installation or use to ensure proper function and longevity of your product.
The BLANCO DIAMOND 50/50 Double Bowl Kitchen Sink is designed for durability and functionality. Crafted from SILGRANIT®, a composite material made of 80% natural granite, it offers exceptional resistance to heat, scratches, acids, and stains. This dual-mount sink can be installed as a drop-in or undermount, featuring a 50/50 bowl design for versatile use.
Key features include:
- SILGRANIT Material: Made of quartz sand, providing long-lasting durability.
- Easy-to-Clean: Non-porous, smooth stone surface for effortless maintenance.
- Resistant Properties: Withstands heat up to 536°F, scratches, acids, and stains.
- Dual Mount Design: Versatile for both drop-in and undermount installations.
- Pre-drilled Faucet Hole: Includes one pre-drilled hole with options for up to four additional knock-out holes for accessories.

Image 1.1: The BLANCO DIAMOND 50/50 Double Bowl Kitchen Sink, showcasing its dual bowl design and Truffle color.
2. Setup and Installation
Proper installation is crucial for the performance and longevity of your BLANCO sink. It is recommended that installation be performed by a qualified professional.
2.1 Before Installation
- Unpack the sink and inspect it for any damage.
- Ensure all included components (mounting hardware, template) are present.
- Verify that your countertop opening matches the sink dimensions and template provided.
2.2 Installation Types
This sink supports two installation methods:
- Drop-In Installation: The sink rim rests on top of the countertop.
- Undermount Installation: The sink is mounted beneath the countertop, creating a seamless look.
2.3 Faucet and Accessory Holes
The sink comes with one pre-drilled hole for a faucet. Up to four additional knock-out holes are available for accessories such as soap dispensers or water filters. Refer to the installation manual for instructions on how to safely create these additional holes.

Image 2.1: Dimensional drawing of the BLANCO DIAMOND 50/50 Double Bowl Kitchen Sink, indicating overall length, width, and bowl depths.
2.4 Detailed Instructions
For complete and detailed installation instructions, please refer to the official Installation Manual (PDF).
3. Operating Instructions
The BLANCO DIAMOND 50/50 Double Bowl Kitchen Sink is designed for efficient kitchen tasks.
3.1 Dual Bowl Functionality
The 50/50 bowl design provides two equally sized basins, ideal for multitasking. You can use one bowl for washing dishes and the other for rinsing, or one for food preparation and the other for soaking.
3.2 Drain Operation
The sink features a Lift and Turn drain type. To open or close the drain, simply lift and turn the stopper mechanism as needed.
4. Maintenance and Care
Maintaining your BLANCO SILGRANIT® sink is simple due to its durable and non-porous surface. Regular cleaning will preserve its appearance and hygienic properties.
4.1 Daily Cleaning
For daily cleaning, use a soft cloth or sponge with mild dish soap and warm water. Rinse thoroughly after cleaning to remove any soap residue.
4.2 Stain Removal
SILGRANIT is highly resistant to stains. For stubborn stains, a non-abrasive cleaner specifically designed for granite composite sinks can be used. Always test any new cleaning product on an inconspicuous area first.
4.3 Avoiding Damage
- Avoid using harsh chemicals, abrasive cleaners, steel wool, or scouring pads, as these can damage the surface finish.
- While the sink is heat resistant, placing extremely hot items (e.g., directly from a hot oven) without a trivet is not recommended for prolonged periods.
- The material is scratch-resistant, but sharp objects should still be handled with care to prevent accidental damage.

Image 4.1: A close-up view of the Truffle color, described as a light earthy taupe, highlighting the smooth, matte finish of the SILGRANIT material.
4.4 Further Guidance
For more detailed care instructions, please consult the official User Guide (PDF).
5. Troubleshooting
This section addresses common issues you might encounter with your BLANCO sink.
5.1 Water Spots or Mineral Deposits
If you notice water spots, especially in hard water areas, they are typically mineral deposits. These can be removed with a solution of white vinegar and water (1:1 ratio) or a specialized descaling agent. Apply, let sit for a few minutes, then scrub gently and rinse thoroughly.
5.2 Dull Appearance
Over time, residue buildup can make the sink appear dull. Ensure you are rinsing the sink thoroughly after each use and cleaning regularly. For a deeper clean, use a granite composite sink cleaner to restore its luster.
5.3 Drainage Issues
If water is draining slowly, check the drain stopper for any obstructions. Ensure the drain assembly is correctly installed and sealed. If the issue persists, it may indicate a plumbing problem beyond the sink itself.
5.4 Persistent Stains
While SILGRANIT is highly stain-resistant, some very strong dyes or chemicals might leave a mark if left for extended periods. Refer to the maintenance section for recommended cleaning agents. For unusual or persistent stains, contact BLANCO customer support.
6. Specifications
Detailed technical specifications for the BLANCO DIAMOND 50/50 Double Bowl Kitchen Sink, Model 441285.
| Attribute | Value |
|---|---|
| Brand | BLANCO |
| Model Number | 441285 |
| Color | Truffle |
| Material | Granite, Silgranit |
| Size (Overall) | 33" L X 22" W X 9.5" D |
| Product Dimensions (Actual) | 21.25"D x 32.25"W x 9.5"H |
| Style | Contemporary |
| Installation Type | Drop-In; Undermount |
| Finish Type | Matt |
| Shape | Rectangular |
| Drain Type | Lift and Turn |
| Item Weight | 45 Pounds |
| Base Width | 22 Inches |
| Hole Count | 1 (with 4 additional knock-out options) |
| UPC | 747943029711 |
| Included Components | Mounting Hardware, Template |
7. Warranty Information
Your BLANCO DIAMOND 50/50 Double Bowl Kitchen Sink is covered by a Limited Lifetime Manufacturer Warranty. This warranty covers defects in material and workmanship under normal use and service. Please retain your proof of purchase for warranty claims.
For full details regarding warranty terms and conditions, please refer to the documentation included with your product or visit the official BLANCO website.
8. Support and Contact
Should you require further assistance, have questions, or need to report an issue, please utilize the following resources:
- Official Documents:
- BLANCO Customer Service: Visit the official BLANCO website for contact information, FAQs, and additional support resources.





