Honeywell/Yushidu pre-filters KF11S-11/2AKF11S-1A are brand new

Ok. This is a detailed technical parameter and product description of Honeywell's (Yushidu) pre-filter KF11S-11/2A (KF11S-1A), presented in paragraph format.

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### Product Overview

Honeywell KF11S-11/2A (often simply referred to as KF11S-1A) is a high-quality, fully automatic backwashing type pre-filter, specifically designed for modern household whole-house water purification systems. As the first core line of defense for the household waterway, it can efficiently filter out large particles such as rust, sediment, eggs of insects, and algae in tap water, protecting expensive household appliances (such as water heaters, dishwashers, washing machines, and smart toilets) and water purification equipment (such as water softeners and terminal drinking water machines) at the back, effectively extending their service life, and enhancing the safety and quality of water used throughout the house.

Core technical parameters

Filtration accuracy: 40 microns. This precision can effectively intercept the vast majority of visible particle impurities, while ensuring smooth water flow and not affecting the normal water pressure of the household.

** * Processing flow rate ** : Up to 2.5 tons per hour, which is sufficient to meet the water demand of large-sized apartments or multiple points using water simultaneously, with minimal water pressure loss.

** * Filter screen material: ** 316L stainless steel filter screen is adopted, which features excellent corrosion resistance and mechanical strength, is durable and poses no risk of secondary pollution.

** * Valve body material: ** High-quality brass valve body, with lead-free treatment inside, meeting safe drinking water standards, sturdy and reliable.

** * Pressure resistance capacity ** : The maximum working pressure can reach 1.6MPa (approximately 16 kilograms), which can adapt to the water pressure environment of different floors and has a high safety factor.

** * Connection diameter: ** Standard 1-inch (DN25) external thread interface, compatible with the mainstream domestic household water pipe diameters.

** * Operating temperature ** : Suitable for cold water environments ranging from 5°C to 40°C.

Core Functions and Features Description

1. Fully automatic backwashing, maintenance-free and worry-free

The most outstanding feature of this product is its innovative "water-driven" fully automatic backwashing function. It is equipped with a precise water volume accumulation timer. When the filtered water flow reaches the preset 5 tons, the filter will automatically start the backwashing program instantly. The entire process does not require electricity. It only relies on water pressure to drive the internal turbine and fork mechanism, instantly changing the direction of water flow. High-pressure water is sprayed from outside the filter screen to thoroughly wash and discharge the trapped dirt.