• Winterizing Engine or Generator
• Winterizing Air Conditioning Unit
• Clearing Clogged Thru-Hull Fittings
• Freshwater Flush

Downloadable Sea Flush Instruction in .pdf

Sea Flush Demonstration

Winterizing Engine or Generator

WARNINGS:

• Verify that the unit has closed cooling. There must be antifreeze in the engine, not seawater. **If the unit does not have closed cooling, see below.
• Check that the level of antifreeze is sufficient for use and storage. Do not remove the cap while the engine is hot.
• Make sure the engine compartment is ventilated prior to using the Shop Vac and starting the engine(s) or generator.
• Stay clear of all moving parts.

Is the boat in water or out of water? If it is out of water, skip steps 3-6

1. Close the seacock valve and open the sea strainer top. Remove the strainer basket.
2. Put the Sea Flush Reservoir into the sea strainer opening and secure with bungee cords by running the bungee cords around the inlet and outlet hoses then placing the hooked ends through the holes on the Sea Flush Reservoir or by hooking the bungee cord back on itself. (See image glossary)
3. Screw the Shop Vac Insert into the Sea Flush Reservoir and push the Shop Vac hose into the Shop Vac Insert. Friction will hold the hose in place. Ventilate the engine/ bilge area by running the blower.
4. Turn on the Shop Vac, open the seacock valve, and verify that there are bubbles outside of boat.
5. Close the seacock.
6. Remove the Shop Vac hose and Shop Vac Insert from the Sea Flush Reservoir. 
7. Fill the Sea Flush Reservoir with biodegradable antifreeze. Ventilate the engine/ bilge area by running the blower.
8. Start the engine/ generator.
9. Continue to add antifreeze until the antifreeze can be seen exiting the engine/ generator exhaust. To avoid damaging the engine or generator, do not run the engine/ generator without antifreeze flowing into the Sea Flush Reservoir.
10. Shut off the engine/ generator when the liquid exiting the exhaust turns the color of the antifreeze.
11. Remove the Sea Flush Reservoir.
12. Replace strainer basket. Make sure the basket is seated properly so that the strainer lid can fully close.
13. Tighten screw the lid on the sea strainer. If nuts secure the cover, alternate tightening the nuts so the cover sits flat on the strainer and is airtight.

The raw water portion of cooling system is now protected from freezing, based on the freeze rating of the antifreeze used.

**If engine or generator doesn’t have a closed cooling system, you can use Sea Flush to winterize, but remove drain plug(s) on the engine to drain raw water. Consult the engine’s owner’s manual for instructions on how to drain the engine block.

Winterizing Engine or Generator Video Demonstration

Winterizing Air Conditioning Unit

WARNINGS:

• Make sure engine compartment is ventilated prior to using the Shop Vac.

Is the boat in water or out of water? If it is out of water, skip steps 4, 5 & 6.

1. Close the seacock valve and open the sea strainer. Remove the filter basket.
2. Put the Sea Flush Reservoir into the sea strainer opening and secure with bungee cords by running the bungee cords around the inlet and outlet hoses then placing the hooked ends through the holes on the Sea Flush Reservoir or by hooking the bungee cord back on itself. (See image glossary)
3. Screw the Shop Vac Insert into the Sea Flush Reservoir and push the Shop Vac hose into the Shop Vac Insert. Friction will hold the hose in place. Ventilate the engine bilge area by running the blower.
4. Cover the teeth of a pair of Vise Grips with Duct tape. Pinch the output hose of the A/C water pump with the taped Vise Grips.**If the boat has multiple A/C units, see below.
5. Turn on the Shop Vac and open the seacock valve. Verify that there are bubbles outside of boat.
6. Close the seacock valve, turn off the Shop Vac, and remove the Vise Grips.
7. Turn the Shop Vac on and look for a forceful stream of water exiting from the A/C’s discharge fitting on the side of the hull. Initially water will blow out of the fitting, followed by air.
8. OPTIONAL STEP FOR VISUAL CONFIRMATION THAT ANTIFREEZE IS IN SYSTEM: Turn off the Shop Vac and remove the hose from the Shop Vac Insert. Pour some antifreeze into the Shop Vac Insert. Replace the hose and turn on the Shop Vac. Look for a small amount of antifreeze blowing out of the water discharge fitting. Repeat this process until it is visible.
9. Remove the Sea Flush Reservoir.
10. Replace strainer basket. Make sure the basket is seated properly so that the strainer lid can fully close.
11. Tighten/ screw the lid onto the sea strainer. If nuts secure the cover, alternate tightening the nuts so the cover sits flat on strainer and is airtight. **If the boat has multiple A/C units serviced by a single pump, pinch all but one outlet hose to isolate that A/C unit. Air will be forced through each A/C unit one at a time. Have another person watching outside the boat to verify that water is forced through each A/C unit’s discharge port.

Winterizing Air Conditioning Unit Video Demonstration

Clearing Clogged Thru-Hull Fittings

WARNINGS:

• Make sure engine compartment is ventilated prior to using the Shop Vac.

1. Open sea strainer and remove strainer basket.
2. Put the Sea Flush Reservoir into the sea strainer opening and secure with bungee cords by running the bungee cords around the inlet and outlet hoses then placing the hooked ends through the holes on the Sea Flush Reservoir or by hooking the bungee cord back on itself. (See image glossary)
3. Screw the Shop Vac Insert into the Sea Flush Reservoir and push the Shop Vac hose into the Shop Vac Insert. Friction will hold the hose in place. Ventilate the engine bilge area by running the blower.
4. IF CLEARING AN A/C UNIT: Use Vise Grips with Duct tape covering the teeth to pinch the output hose of the A/C water pump. This will force air down to the thru-hull fitting.
5. Turn on the Shop Vac and look for bubbles outside of the boat. Depending on the severity of the clog, this may take several minutes. In rare instances a thru-hull fitting may be clogged so badly that the debris needs to be physically removed. In these cases, the Sea Flush method may not be effective.
6. When bubbles are visible, the clog has been cleared.
7. Close the seacock, turn off the Shop Vac and remove the Sea Flush Reservoir.
8. Replace the strainer basket. Make sure the basket is seated properly so that the strainer lid can fully close.
9. Tighten screw the lid on the sea strainer. If nuts secure the cover, alternate tightening nuts so the cover sits flat on strainer and is airtight.

Clearing Clogged Thru-Hull Fittings Video Demonstration

Freshwater Flush

WARNINGS:

• Make sure the engine compartment is ventilated prior to starting the engine.