System Flushes vs. Cleaners: What You Need to Know

We’re often asked about flushing fluids when, in reality, what’s needed is a system cleaner. So what’s the actual difference?

Flushes

Flushes are generally used to rinse a system. This includes newly commissioned thermal fluid systems where it’s important to remove leftover construction debris such as weld slag, bolts, or other particles that could cause damage if left behind.

They’re also effective for clearing out degraded fluid when a system cannot be completely drained. This is critical because old, degraded oil can contaminate fresh fluid and shorten its service life.

Flushes are sometimes necessary when switching to a different type of thermal fluid, especially if the new chemistry is not compatible with the previous one. For instance, transitions to or from silicone-based fluids often require flushing.

The key takeaway is that flushes will not clean a system. They can’t dissolve sludge or remove carbon buildup—that type of work requires a system cleaner.

System cleaners

System cleaners are designed to break down carbon deposits and dissolve sludge. They generally fall into three main categories:

• Solvent-like cleaners – These are used for heavily fouled systems. They dissolve sludge and carbon quickly, often within hours, but typically are not used while the system is in production.
• Additive-type cleaners – These concentrated cleaners are added to existing fluid to treat moderately fouled systems over several weeks. They’re especially useful for large systems where solvent-type cleaners may be too costly. Many can be used while the system remains in operation.
• Hybrid fluid/cleaners – These function as both a thermal fluid and a system cleaner. They allow normal production while simultaneously cleaning the system. Once the cleaning phase is complete, they continue to serve as long-term heat transfer fluids.

To learn more about our full range of system cleaners, reach out—we’re happy to answer any questions.