I. Planning and Preparation:
1. Check Local Codes and Regulations:
* This is the most important step. Plumbing codes vary significantly by location. You need to know the specific requirements for backwash unit installations, including:
* Backflow prevention requirements (critical for protecting the potable water supply).
* Drainage and vent requirements.
* Materials allowed (e.g., PVC, CPVC, PEX, copper).
* Permit requirements.
* Inspection requirements.
* Contact your local building department or plumbing inspector to obtain this information.
* Failure to comply with codes can result in fines, rework, and even legal issues.
2. Choose a Location:
* Proximity to Plumbing: Select a location near existing water supply lines and a drain. The closer, the better, as it will reduce the amount of new plumbing required and lower costs.
* Space and Accessibility: Ensure you have enough space to comfortably install and use the backwash unit. Consider the client's comfort and the stylist's reach. Leave room for maintenance and future repairs.
* Floor Level: Ideally, the backwash drain should be at the same level as, or slightly higher than, the main drain line it's connecting to. This ensures proper drainage. If the floor isn't level, you might need to use a pump (see Step 8).
* Client Comfort: Consider lighting, privacy, and overall atmosphere in the area.
3. Select the Backwash Unit:
* Features: Choose a unit with the features you need (e.g., adjustable bowl, sprayer type, footrest).
* Dimensions: Take precise measurements of the unit. You'll need these for planning the plumbing layout.
* Water Supply Connections: Identify the size and type of water supply connections (usually 1/2" NPT).
* Drain Connection: Determine the size and type of drain connection (usually 1 1/2" or 2" pipe).
4. Gather Materials and Tools:
* Pipes and Fittings: Based on local codes and your existing plumbing, choose the appropriate type of pipe (PVC, CPVC, PEX, copper) and all necessary fittings (elbows, tees, couplings, adapters).
* Water Supply Lines: Flexible supply lines (e.g., braided stainless steel) are often used to connect the water supply to the backwash unit. Ensure they are the correct length and fitting size.
* Drain Pipe: Use appropriate diameter drain pipe (usually 1 1/2" or 2").
* P-Trap: Essential for preventing sewer gases from entering the salon.
* Air Admittance Valve (AAV) or Vent Pipe: This allows air into the drain line to prevent siphoning and ensure proper drainage. AAVs are often allowed in place of a full vent pipe, but check local codes.
* Backflow Preventer: A crucial safety device to prevent contaminated water from flowing back into the potable water supply. The type of backflow preventer required will vary depending on local codes. A Reduced Pressure Zone (RPZ) backflow preventer is often required for salon sinks.
* Shut-Off Valves: Install shut-off valves on both the hot and cold water supply lines close to the backwash unit. This allows you to turn off the water for maintenance or repairs without shutting off the entire building's water supply.
* Plumber's Tape (Teflon Tape): For sealing threaded connections.
* Pipe Joint Compound (Pipe Dope): For sealing threaded connections. Use a type compatible with the pipe material.
* Primer and Cement (for PVC or CPVC): For joining PVC or CPVC pipes and fittings.
* Solder and Flux (for Copper): For soldering copper pipes and fittings.
* Tools:
* Pipe cutter (for the type of pipe you're using)
* Pipe wrench
* Adjustable wrench
* Screwdrivers
* Level
* Measuring tape
* Drill with appropriate bits
* Safety glasses
* Gloves
* Soldering torch (for copper)
* Sandcloth (for copper)
II. Plumbing the Backwash Unit:
1. Turn Off the Water Supply: Locate the main water shut-off valve and turn it off before starting any plumbing work. Open a faucet at the lowest point in the building to relieve pressure in the pipes.
2. Install Water Supply Lines:
* Connect to Existing Supply Lines: Tap into the existing hot and cold water supply lines using tees. Install shut-off valves on each line before the tee.
* Install Backflow Preventer: Install the required backflow preventer according to the manufacturer's instructions and local codes. This is typically installed *after* the shut-off valves on the water supply lines.
* Run Supply Lines to the Backwash Unit: Run the water supply lines (using your chosen pipe material) from the shut-off valves to the backwash unit. Use flexible supply lines to connect the final portion to the unit's water inlets.
* Connect Supply Lines to the Unit: Connect the flexible supply lines to the hot and cold water inlets on the backwash unit. Use plumber's tape or pipe dope on all threaded connections.
3. Install the Drain Line:
* Connect to the Backwash Unit: Connect the drain pipe to the backwash unit's drain outlet.
* Install the P-Trap: Immediately after the drain outlet, install a P-trap. The P-trap is crucial for preventing sewer gases from entering the salon.
* Install the Vent:
* Air Admittance Valve (AAV): If allowed by local codes, install an AAV on the drain line *after* the P-trap, as high as possible. The AAV should be accessible for maintenance.
* Vent Pipe: If required by local codes, connect the drain line to an existing vent pipe, or extend a new vent pipe through the roof. This is a more complex task and typically requires professional expertise.
* Connect to the Main Drain Line: Connect the drain line to the main drain line. This may involve cutting into the existing drain line and using a tee fitting. Ensure proper slope (1/4 inch per foot) for the drain line to promote good drainage.
4. Secure the Backwash Unit:
* Follow the manufacturer's instructions for securing the backwash unit to the floor or wall. This may involve bolting it in place.
5. Test for Leaks:
* Slowly turn on the water supply valves.
* Carefully inspect all connections for leaks.
* Run water through the backwash unit to check the drain for leaks and proper drainage.
* Tighten any leaking connections.
* If leaks persist, disassemble the connection and re-seal it with plumber's tape or pipe dope.
III. Special Considerations:
6. Backflow Prevention: *This is critically important*. Hair salons pose a significant risk of backflow contamination. A properly installed and maintained backflow preventer is essential to protect the potable water supply. Consult your local plumbing inspector to determine the specific type of backflow preventer required (e.g., RPZ, double check valve).
7. Water Heater: Ensure your water heater is adequately sized to provide enough hot water for the backwash unit and any other hot water needs in the salon.
8. Drainage Issues (Low Drain Line): If the existing drain line is too high, and the backwash unit's drain is lower, you may need to install a drain pump (also called a macerating pump) to pump the wastewater up to the drain line. This adds complexity to the installation.
9. Chemical Resistance: If you plan to use harsh chemicals in the backwash unit, make sure the drain pipe and P-trap are made of materials that are resistant to those chemicals.
10. Accessibility: Consider the accessibility of the plumbing for future maintenance and repairs. Avoid burying pipes behind walls if possible. Install cleanouts in the drain line to allow for easy clearing of clogs.
IV. Post-Installation:
11. Inspection: Schedule an inspection with your local building department to ensure the plumbing installation meets all code requirements.
12. Maintenance: Regularly inspect the plumbing for leaks and proper drainage. Clean the P-trap periodically to prevent clogs. Have the backflow preventer tested annually by a certified tester.
Disclaimer: This guide is for informational purposes only and should not be considered a substitute for professional advice from a licensed plumber. Improper plumbing can lead to water damage, health hazards, and legal consequences. It is strongly recommended to hire a qualified plumber for this type of installation.