Product Description
Coil Descaler for Pressure Washer Coil Scale Removal
Karcher Coil Descaler is a professional powder descaler designed to remove hard-water scale buildup from pressure washer coils and heating systems.
Scale buildup can reduce water flow, reduce heat transfer, increase energy use, and put extra strain on the pump. Regular coil descaling helps restore pressure washer performance and supports long-term equipment maintenance.
Product Data
- Product: Coil Descaler
- Brand: Karcher
- Manufacturer Part Number: 9.803-742.0
- Monster SKU: MPK98037420
- Product Type: Pressure washer coil descaler
- Use Type: Coil descaling, hard-water scale removal, pressure washer maintenance, and heat transfer restoration
- Recommended Equipment: Compatible Karcher pressure washer coils and heating coils
- Dilution: 1:16
- Mix Rate: 8 oz per gallon of cool water
- Yield: Each 2 lb container makes 4 gallons
- Water Temperature: Cool water only
- pH at Full Strength: 1.48 at 1% solution
- pH at Use Dilution: 0.98 at 1:16
- Color / Appearance: White powder
- Fragrance: Slight detergent / characteristic odor
- Foaming: Medium
- Hard Water Reaction: 5 = Best
- Photochemically Reactive Ingredients: 0%
- Kosher Certified: Yes, year round not including Passover
- Package Size: Case of 12 x 2 lb containers
- Packaged Dimensions: 15.5 x 11 x 7.5 in
- UPS Shipping: Yes
Recommended Use
- Pressure washer coil descaling
- Hard-water scale removal
- Heating coil maintenance
- Restoring water flow through scaled coils
- Improving heat transfer efficiency
- Reducing pump strain caused by mineral buildup
- Preventive maintenance for hot water pressure washers
Important Use Notes
- Use cool water only.
- Do not use hot water.
- Mix in an acid-resistant container.
- Always add Coil Descaler to water, never water to Coil Descaler.
- Do not allow Coil Descaler to flow through the high-pressure pump.
- Do not use on aluminum or tin.
- Wear rubber gloves and goggles during use.
Compatible Karcher Pressure Washer Equipment
Coil Descaler is used for compatible Karcher pressure washer coil maintenance. Do not run descaling solution through the high-pressure pump. Circulate the mixed solution through the coil only, then flush thoroughly with fresh water.
HD Cold Water Pressure Washers
- HD 1.9/13 Ed
- HD 2.5/27 P
- HD 3.0/10 Ed
- HD 3.0/20 M Cage
- HD 3.0/27 G Teton
- HD 3.0/27 GB Teton
- HD 3.0/30 P
- HD 3.0/40 PB
- HD 3.5/20 Ea
- HD 3.5/35 G Teton
- HD 3.5/35 GB Teton
- HD 3.5/40 P
- HD 3.7/35 PB
- HD 3.8/35 P
- HD 4.0/40 G Teton
- HD 4.0/40 GB Teton
- HD 4.0/40 Ge Teton
- HD 4.0/40 GeB Teton
- HD 4.0/50 PeB Cage
- HD 4.5/50 PeB Cage
- HD 4/8 X Classic
- HD 5.0/30 GB Teton
- HD 5.0/30 GeB Teton
- HD 5.0/50 Ec Cage
- HD 1.8/13 C Ed
- HD 1.8/14 Ed
- HD 2.0/1000 Dual Mister
- HD 2.0/1000 Dual Mister Cart
- HD 2.5/27 P ATV
- HD 3.0/27 G
- HD 3.1/31 P
- HD 3.5/35 G
- HD 4.0/36 P
- HD 4.0/40 GeB
- HD 4.5/32-4 S Eb
- HD 4.5/32-4 S Ec
HD Equipment Families
- HD Cabinet
- HD Compact Class
- HD Mid Class Cage Series
- HD PB Cart
- HD PB/PeB/D Cage
- HD Roll Cage
- HD Series Electric
- HD Wall Mounted
- HD Cart
- HD Mid Class
- HD PB/D Cage
- HD Special Class
- HD Super Class
- Pro Am HD
- Pro HD 400
HDS Hot Water Pressure Washers
- HDS 2.2/12 Ed
- HDS 3.0/20-4 Ea/Eg Standard
- HDS 3.5/30-4 Ea/Eg Standard
- HDS 3.5/30-4 Eg
- HDS 3.5/35 P Cage
- HDS 3.5/35 Pe Cage
- HDS 4.0/20 E Ef
- HDS 4.0/20-4 Ec Premium
- HDS 4.0/20-4 Eg
- HDS 4.0/20-4 Eh/Eb Premium
- HDS 4.0/30 E Ec
- HDS 4.0/30 E Ef
- HDS 4.0/30-4 Eb/Eb Premium
- HDS 4.0/30-4 Ec Premium
- HDS 4.0/30-4 Ef Premium
- HDS 4.7/35 Pe Cage
- HDS 4.8/30 Pe Cage
- HDS 5.0/30-4 Ec Premium
- HDS 5.0/30-4 Ef
- HDS 5.0/30-4 Eh/Eb
- HDS 5.6/35 De Cage
- HDS 8.0/30 Ge Cage
- HDS 801-4 E
- HDS-E 3.3/25-4 M Ef
- Karcher HDS 3.5/40 Ge VMT
- Heater 4.2/30
HDS Equipment Families
- HDS Cabinet
- HDS Heater
- HDS P/PE Cage
- HDS Special Class
- HDS Upright Class
- HDS VHP
- HDS Compact Class
- HDS Hand Truck
- HDS Mid Class
- HDS Pe Cage
- HDS Super Class
Sechura HDS ST LP / NG Systems
- Sechura HDS 3.5/20 Ea ST LP
- Sechura HDS 3.9/30 Ea ST LP
- Sechura HDS 3.9/30 Ea ST NG
- Sechura HDS 3.9/30 Eb ST LP
- Sechura HDS 3.9/30 Eb ST NG
- Sechura HDS 3.9/30 Ec ST LP
- Sechura HDS 3.9/30 Ec ST NG
- Sechura HDS 3.9/30 Ef ST LP
- Sechura HDS 3.9/30 Ef ST NG
- Sechura HDS 3.9/30 Eg ST LP
- Sechura HDS 3.9/30 Eg ST NG
- Sechura HDS 3.9/30 Eh ST LP
- Sechura HDS 3.9/30 Eh ST NG
- Sechura HDS 4.0/22 Ea ST LP
- Sechura HDS 4.0/22 Ea ST NG
- Sechura HDS 4.0/22 Eb ST LP
- Sechura HDS 4.0/22 Eb ST NG
- Sechura HDS 4.0/22 Ec ST LP
- Sechura HDS 4.0/22 Ec ST NG
- Sechura HDS 4.0/22 Ef ST LP
- Sechura HDS 4.0/22 Ef ST NG
- Sechura HDS 4.0/22 Eg ST LP
- Sechura HDS 4.0/22 Eg ST NG
- Sechura HDS 4.0/22 Eh ST LP
- Sechura HDS 4.0/22 Eh ST NG
Large Sechura HDS Systems
- Sechura HDS 4.8/30 Ea ST LP
- Sechura HDS 4.8/30 Ea ST NG
- Sechura HDS 4.8/30 Eb ST LP
- Sechura HDS 4.8/30 Eb ST NG
- Sechura HDS 4.8/30 Ec ST LP
- Sechura HDS 4.8/30 Ec ST NG
- Sechura HDS 4.8/30 Ef ST LP
- Sechura HDS 4.8/30 Ef ST NG
- Sechura HDS 4.8/30 Eg ST LP
- Sechura HDS 4.8/30 Eg ST NG
- Sechura HDS 4.8/30 Eh ST LP
- Sechura HDS 4.8/30 Eh ST NG
- Sechura HDS 5.0/22 Eg ST LP
- Sechura HDS 5.0/23 Ea ST LP
- Sechura HDS 5.0/23 Ea ST NG
- Sechura HDS 5.0/23 Eb ST LP
- Sechura HDS 5.0/23 Eb ST NG
- Sechura HDS 5.0/23 Ec ST LP
- Sechura HDS 5.0/23 Ec ST NG
- Sechura HDS 5.0/23 Ef ST LP
- Sechura HDS 5.0/23 Ef ST NG
- Sechura HDS 5.0/23 Eg ST NG
- Sechura HDS 5.0/23 Eh ST LP
- Sechura HDS 5.0/23 Eh ST NG
- Sechura HDS 6.3/32 Eb ST LP
- Sechura HDS 6.3/32 Eb ST NG
- Sechura HDS 6.3/32 Ec ST LP
- Sechura HDS 6.3/32 Ec ST NG
- Sechura HDS 6.3/32 Ef ST LP
- Sechura HDS 6.3/32 Ef ST NG
- Sechura HDS 6.3/32 Eh ST LP
- Sechura HDS 6.3/32 Eh ST NG
- Sechura HDS 8.0/32 Eb ST LP
- Sechura HDS 8.0/32 Eb ST NG
- Sechura HDS 8.0/32 Ec ST LP
- Sechura HDS 8.0/32 Ec ST NG
- Sechura HDS 8.0/32 Ef ST LP
- Sechura HDS 8.0/32 Ef ST NG
- Sechura HDS 8.0/32 Eh ST LP
- Sechura HDS 8.0/32 Eh ST NG
- Sechura HDS 9.5/30 Eb ST LP
- Sechura HDS 9.5/30 Eb ST NG
- Sechura HDS 9.5/30 Ec ST LP
- Sechura HDS 9.5/30 Ec ST NG
- Sechura HDS 9.5/30 Ef ST LP
- Sechura HDS 9.5/30 Ef ST NG
- Sechura HDS 9.5/30 Eh ST LP
- Sechura HDS 9.5/30 Eh ST NG
- Sechura NG/LP Series
Trailer, Water Jetter & Specialty Systems
- Jalapao Series
- Jarvis SCW 2.4/25 G
- Jarvis SCW 4.0/40 G
- K-Jet 2500 Water Jetter
- Mojave Series
- TRK-3500 Trailer
- TRK-3500H Preconfigured Trailer
- TRK-6000 Trailer
- Trailer Karcher 3500E HDS 4.7/35
- Tule Series HDS 3.5/40 GE MT
- TRK-2500 HDS 4.7/35 trailer system
- TRK-2500 trailer system
- TRK-3500 trailer system
- Tabernas Series
Package Size Options
- 9.803-742.0 / MPK98037420 - Case of 12 x 2 lb containers
Package Size Pricing: Select the package size above to view updated pricing and availability. Product specifications and application information apply to Coil Descaler 9.803-742.0.
Application Directions
- Read the Safety Data Sheet thoroughly before using this product.
- Pre-mix 8 oz of Coil Descaler per gallon of cool water in an acid-resistant container.
- Always add Coil Descaler to water, never the reverse.
- Do not use hot water.
- Adjust dilution only as needed based on the amount of scale buildup.
- Circulate the liquid mixture through the coils for 2 to 3 hours.
- Do not allow Coil Descaler to flow through the high-pressure pump.
- After circulation, flush with fresh water for 15 minutes.
- Do not use on aluminum or tin.
Safety & Handling
- Industrial use only.
- Read all label directions and Safety Data Sheet before use.
- Wear rubber gloves and goggles during use.
- Use only in compatible pressure washer coil descaling applications.
- Mix only in an acid-resistant container.
- Do not use hot water.
- Do not use on aluminum or tin.
- Avoid contact with skin and eyes.
- Avoid release to the environment.
- Store in a cool, well-ventilated place.
- Keep container sealed when not in use.
- Keep out of reach of children.
Documents
Shipping Information
This product ships as a case of 12 x 2 lb Coil Descaler containers. This item ships UPS according to the product information sheet. Pallet quantities and large facility orders are available.
Facility & Bulk Purchase Programs
Need coil descaler, pressure washer maintenance chemicals, hard-water scale remover, pump and coil protectant, or pressure washer service chemicals for a large facility, fleet, or contractor program? Monster Janitorial provides special pricing for commercial and institutional buyers.
Orders over $15,000 may qualify for free freight. Contact sales@monsterjanitorial.com for a custom quote.
Why Choose Monster Janitorial?
- Professional-grade commercial pressure washer chemicals
- Fast order processing on most in-stock products
- Expert support from commercial cleaning and pressure washer chemical specialists
Tax-Exempt Purchasing
Create an account and email your tax exemption certificate to sales@monsterjanitorial.com to enable tax-free purchasing on qualifying orders.
Chemical Guides & Floor Care Resources
Need help choosing the right coil descaler, pressure washer chemical, descaling product, pump protectant, or hard-water maintenance chemical? Monster Janitorial provides chemical guides, application information, and maintenance best practices for commercial cleaning teams.
Product Videos
Custom Field
Application Pressure Washer Coil Descaling
Chemical Type Coil Descaler / Hard-Water Scale Remover
Surface Types Pressure Washer Coils, Heating Coils, Compatible Descaling Systems
Compatible Equipment HD Pressure Washer, HDS Pressure Washer, Hot Water Pressure Washer, Cold Water Pressure Washer, Trailer Pressure Washer, Cabinet Pressure Washer, Wall-Mounted Pressure Washer, Water Jetter, Coil Descaling System
Dilution Ratio 1:16
pH 8 oz per gallon of cool water
Fragrance Slight Detergent / Characteristic Odor
Appearance White Powder
