GMR Backflow

GMR Backflow Backflow testing for San Antonio and surrounding areas

Backflow License -0020289

New fire line backflow assembly installed in San Antonio.The previous unit had reached the point where repair wasn’t the...
03/05/2026

New fire line backflow assembly installed in San Antonio.

The previous unit had reached the point where repair wasn’t the right move, so we replaced the assembly and set a new one in place. Proper elevation, correct clearances, and fully tested before leaving the site.

On commercial properties, these assemblies are a critical part of protecting the water supply and keeping the building compliant with local requirements.

Once installed, we complete the test, submit the report, and make sure everything is documented correctly.

If your backflow assembly is beyond repair or consistently failing year after year, replacement may be the better long term solution.

Fire line backflow testing in San Antonio.Depending on the system design, fire lines here may be protected by a Double C...
03/03/2026

Fire line backflow testing in San Antonio.

Depending on the system design, fire lines here may be protected by a Double Check (DC) or a Reduced Pressure assembly (RP). Local requirements vary, and it’s important that the correct assembly is installed and tested according to code.

Annual testing verifies that the check valves are holding properly and that the assembly is doing its job protecting the public water supply. Even though fire systems don’t flow every day, the water inside can sit for long periods, which is why these devices still require regular inspection and testing.

If you manage a commercial property with a fire line backflow assembly, we handle annual testing, reporting, and repairs to keep everything compliant.

After hours call in San Antonio on this Wilkins assembly.The relief was dumping water and the unit had failed its test. ...
02/27/2026

After hours call in San Antonio on this Wilkins assembly.

The relief was dumping water and the unit had failed its test. Instead of replacing the entire assembly, we installed a full internal repair kit, rebuilt it correctly, and retested it on site.

Back in service the same night.

Backflow assemblies usually don’t fail all at once. Internal components wear down over time, and when springs or check modules start weakening, you’ll see it show up at the relief port just like this.

If your backflow is constantly dripping or spraying, it needs to be repaired.

This is what a properly installed RP (Reduced Pressure Principle) backflow assembly looks like during annual testing.Eac...
02/26/2026

This is what a properly installed RP (Reduced Pressure Principle) backflow assembly looks like during annual testing.

Each year, these assemblies are required to be tested to make sure:

• Check valve #1 is holding
• Check valve #2 is holding
• The relief valve opens at the correct differential

The relief valve is the safety component. If something internally fails, it will discharge water rather than allow contaminated water to move backward into the supply.

Most people never think about this assembly, but it’s one of the most important pieces of plumbing on a property.

If your annual test notice shows up in the mail, this is what we’re there to verify.

Annual backflow test didn’t pass on this Watts 009M2 RP assembly here in San Antonio.Instead of jumping straight to repl...
02/26/2026

Annual backflow test didn’t pass on this Watts 009M2 RP assembly here in San Antonio.

Instead of jumping straight to replacement, we installed a full repair kit and brought the assembly back within specs. New internal components, reassembled, retested, and back in service.

These 009s are solid assemblies, but like anything mechanical, check springs and relief valve components wear over time. That’s exactly why annual testing matters it catches issues before they become bigger problems.

If your backflow test is coming up in San Antonio or surrounding areas, we handle testing and repairs the right way.

This is a Reduced Pressure (RP) backflow assembly.An RP is considered a high hazard assembly, which means it’s used anyw...
01/30/2026

This is a Reduced Pressure (RP) backflow assembly.

An RP is considered a high hazard assembly, which means it’s used anywhere there’s a serious risk of contamination to the water supply. It can be installed in just about any situation where protection is required, which is why you’ll see them on commercial buildings, irrigation systems, medical facilities, and industrial sites.

One of the key features of an RP is the relief valve underneath. If anything goes wrong internally, debris, worn parts, pressure issues, the relief valve will drip or discharge water. That’s not a defect. It’s the assembly doing exactly what it’s designed to do: protect the water system.

Because these assemblies protect against high-hazard conditions, they typically must be tested annually and kept in proper working order.

If you ever notice an RP leaking from the relief, it’s a sign that something inside needs attention, not something to ignore.

This RP backflow was leaking from the relief valve.Inside, the problem turned out to be debris stuck in the relief, keep...
01/29/2026

This RP backflow was leaking from the relief valve.

Inside, the problem turned out to be debris stuck in the relief, keeping it from sealing properly. That small obstruction was enough to cause a steady drip and make it look like the whole assembly was failing.

Once it was cleaned out, the valve could operate normally again.

This is a good reminder that not every leaking or failing assembly needs to be replaced right away. A lot of issues can be repaired if you take the time to open it up, find the actual cause, and fix what’s really wrong.

Replace when you have to. Repair when you can.

This backflow failed because the check rubber wore out.When rubber parts get old and lose their flexibility, they can’t ...
01/27/2026

This backflow failed because the check rubber wore out.

When rubber parts get old and lose their flexibility, they can’t seal properly. At that point, cleaning won’t fix it. The part has to be replaced and the assembly retested.

Just normal wear over time, but something you’d never see without taking it apart.

This is a fire protection system backflow assembly.Unlike domestic or irrigation backflows, fire line assemblies require...
01/23/2026

This is a fire protection system backflow assembly.

Unlike domestic or irrigation backflows, fire line assemblies require a tester who holds the appropriate fire protection certification. These systems are tied directly to life safety, fire department requirements, and insurance compliance.

Fire backflows aren’t just about water quality, they’re about ensuring the system operates correctly when it’s needed most. Testing must be done properly, documented correctly, and submitted to the correct authority.

Not every backflow tester is qualified to test fire systems, which is why it’s important to verify credentials before scheduling.

Sometimes it’s not as simple as cleaning debris and putting parts back together.Backflow assemblies have internal compon...
01/22/2026

Sometimes it’s not as simple as cleaning debris and putting parts back together.

Backflow assemblies have internal components that wear out and fail over time. When that happens, the correct fix is replacing the failed parts and then retesting to verify proper operation.

While repairs don’t require additional licensing, many testers choose to only perform the test itself and leave repairs to someone else, or don’t offer them at all.

Identifying a failure is only part of the job. Being able to repair it correctly and confirm it passes afterward is what actually resolves the issue.

This failure was caused by rocks entering the line after an upstream repair.When water lines are opened without proper f...
01/20/2026

This failure was caused by rocks entering the line after an upstream repair.

When water lines are opened without proper flushing and protection, debris like this can travel downstream and lodge inside a backflow assembly. Once that happens, the device can’t seal or operate correctly.

This is why repairs on potable water systems need to be done by licensed professionals who understand downstream impacts. Small shortcuts upstream can create major failures later.

Most of these issues are completely avoidable with proper procedures.

Address

Universal City, TX
78148

Opening Hours

Monday 8am - 7pm
Tuesday 8am - 7pm
Wednesday 8am - 7pm
Thursday 8am - 7pm
Friday 8am - 7pm
Saturday 8am - 7pm
Sunday 8am - 7pm

Telephone

(210) 428-7451

Website

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