Case study · Preventive maintenance

Water-Source Heat Pump Strainer Cleaning – Nolita, Manhattan

Water-source heat pumps depend on a steady flow of clean loop water. The strainer catches the sludge before it reaches the unit, and when it clogs, flow drops and the unit can fault. We cleaned the strainers over several visits across about a year and documented what came out.

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LocationCommercial space, Nolita, Manhattan
EquipmentWater-source heat pumps with inline strainers
Condition foundStrainer baskets packed with sludge
ServiceStrainer and filter cleaning, repeat visits 2025–2026
BeforeAfter Strainer basket before and after cleaning: clogged with brown sludge on the left, clean stainless mesh on the right
Strainer basket as pulled (left) and after cleaning (right).

What we found

  • Strainer baskets packed with brown sludge and scale.
  • Sludge inside the strainer body as well as the basket.
  • Dirty brown water coming out when the strainer was flushed.
  • Air filters loaded with dust.

What we did

  • Isolated the strainer and pulled the basket.
  • Flushed the strainer body and cleaned the basket until the mesh was clear.
  • Reinstalled the strainer and checked for leaks.
  • Cleaned the air filters and checked the unit.

As found

Opened strainer body packed with brown sludge and scale
Sludge packed inside a strainer body (Sep 2025).
Strainer basket clogged with dark sludge
Clogged strainer basket (Aug 2025).
Strainer basket clogged with dark sludge held over a sink
Clogged basket again at a later visit (Jul 2026).

Cleaning and filters

Orange bucket holding brown water flushed from a strainer
Brown water from flushing the strainer (Sep 2025).
Strainer basket being cleaned in a clear container of water
Cleaning a strainer basket (Apr 2026).
Pleated air filter loaded with dust
Air filter loaded with dust (Apr 2026).

Our recommendation: put strainers on a cleaning schedule

A clogged strainer cuts water flow to the heat pump and can trip it on a safety. Sludge in a water loop keeps coming, so the fix is a scheduled check, not a one-time cleaning.

We can set up recurring strainer and filter service for every unit in your building, with a written photo report after each visit.

Request strainer service

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