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Your cart is empty.Mainstream Marine Descaler Solution – 1 Gallon Refill Using a high-quality, safe descaling solution like this one is a great way to keep your boat’s water systems working efficiently. If they’re not regularly cleaned and flushed, they’ll start to develop buildups like mussels, barnacles, calcium, rust, and other water-formed mineral deposits. The result is that flow will be hindered and systems begin to malfunction. You’ll then be looking at much bigger issues that you have to deal with. It’s essential to flush marine engines and air conditioner systems. Color Changing Properties Eliminates The Guesswork How much is too much? How will I know if it's working? This descaler will let you know for sure! When flushing marine engines, if the solution comes out yellow add more. Once the solution cycles through, and remains red, then stop. Won’t Damage Your Equipment or the Environment The formula is biodegradable and non-toxic, so it’s safe to use around all marine environments. It will flush and improve efficiency without damaging seals, gaskets, impellers, or other components.
JBL
Reviewed in the United States on January 25, 2025
Used this to flush a clogged heater core. Can’t believe how much debris it cleaned out. My heater core was almost completely clogged but now flows like new.
Bryn
Reviewed in the United States on October 14, 2024
So tried this product over redline since I couldn’t get the other product in timeSadly didn’t really do much for me … engine block looks about the same still has build ups and isn’t really clean …
Daniel Burk
Reviewed in the United States on June 12, 2023
The cleaner worked great
Don Lucas
Reviewed in the United States on October 10, 2022
Circulated through my boat seawater loop with a rotary pump. Loosened up so much "stuff" that the loop plugged more than the pump could do. After connected a garden hose to the system and blew out tones of scale and shells. Never seen as much flow through the system afterward. Did exactly what I wanted.
Rob
Reviewed in the United States on July 3, 2019
While I like the color change feature, it took a full gallon to 3 gallons of water to flush a 7.4L Crusader Raw water side in a closed loop. The heat exchanger and oil cooler were in this loop. I started with 1 quart to 3 gallons, had to add more at 2 hours then more at 20 more minutes, then the rest of the gallon in 20 more minutes. Circulated for 3.5 hours before color stabilized at very pale pink. Nice feature, but at $8 a gallon for 30% Muritic acid (pool supply stores) versus $35 a gallon for 2% Muritic acid (this product) with a color change indication of acidity, I can buy a lot of litmus paper!!!
E. Martinez
Reviewed in the United States on June 6, 2019
It's nothing more than Muriatic acid (Hydrochloric Acid) like what you would put in your pool, except that is diluted to 2%. So I just paid $35 for 98% water and some red litmus to turn the stuff yellow when it goes basic. Just as a comparison you can buy a gallon of 30% muriatic acid for $10 at your local hardware store, which would make the equivalent of 15 gallons of this stuff.
Turtle on a Rock
Reviewed in the United States on May 18, 2019
I used this to remove sea growths that had clogged the seawater side of my boat's air conditioner. I injected it into the system from the outside seawater drain port, let it sit for an hour, and then flushed with fresh water. It took several passes for the cleaner to remain pink/red. The compound loses the red tint as it dissolves the growths. I was much more comfortable using this than various acids, as recommended by many yachters and service techs.
Danno
Reviewed in the United States on August 17, 2018
I used this to clean the heat exchanger on our inboard diesel engine. After 3 flushes, the color stopped changing. Operating temps are back to normal, and all is well! No mess, no fuss. Great product!
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