Question 1

What causes grease blockages in drain pipes?

Accepted Answer

Grease blockages form when fats, oils, and grease — commonly called FOG — are washed down drains and begin to cool and solidify inside the pipe. Grease doesn't stay liquid; it cools rapidly as it moves away from the hot water source and adheres to the interior walls of the pipe. Over time, layer upon layer of grease accumulates, progressively narrowing the pipe until flow is severely restricted or completely blocked. The problem is accelerated in pipes with rough interior surfaces, horizontal runs with low slope, and in cold climates where pipes in unconditioned spaces cool quickly.

Question 2

Can I use a chemical drain cleaner to remove a grease blockage?

Accepted Answer

Store-bought chemical drain cleaners are generally ineffective against serious grease blockages and can damage older pipe materials, particularly cast iron and galvanized steel. While caustic or enzyme-based products may soften the surface of a grease mass, they rarely clear the full blockage or clean the pipe walls — meaning the clog returns quickly. For a true grease blockage, professional hydrojetting is the most effective solution because it physically scours grease from the pipe walls using high-pressure water rather than relying on chemical reactions alone.

Question 3

What is hydrojetting and how does it remove grease?

Accepted Answer

Hydrojetting uses a high-pressure water pump and a specialized nozzle inserted into the drain line to blast water at pressures typically ranging from 1,500 to 4,000 PSI depending on the pipe size and blockage severity. Rotating jetting nozzles spray water in multiple directions simultaneously, scrubbing grease deposits from the full circumference of the pipe wall rather than just the center. The loosened grease and debris are then flushed downstream toward the sewer main. Hydrojetting is significantly more effective than cable augering for grease removal because it cleans the entire pipe bore rather than simply creating an opening through the clog.

Question 4

How is commercial grease blockage removal different from residential?

Accepted Answer

Commercial kitchens generate far greater volumes of grease-laden wastewater and often have more complex drain systems with multiple fixtures, floor drains, grease traps, and longer lateral runs. Commercial grease blockages may affect multiple drain lines simultaneously and can be more deeply embedded due to the higher temperatures and volumes involved. Commercial service also typically includes grease trap outlet and inlet line clearing in addition to the drain lines themselves. Restaurants and food service operations may also be subject to municipal pretreatment requirements or health codes that govern grease trap maintenance intervals.

Question 5

How often should commercial kitchen drain lines be cleaned to prevent grease blockages?

Accepted Answer

The appropriate frequency depends on the volume and type of cooking your kitchen performs. High-volume operations like full-service restaurants may benefit from quarterly hydrojetting of key drain lines, while lower-volume operations such as office cafeterias or small cafes might manage well with semi-annual service. Grease trap pumping frequency is a separate consideration governed by the trap's capacity and your kitchen's output. Tandem Mechanical can assess your specific drain system and usage pattern and recommend a maintenance interval that keeps lines clear without over-servicing.

Question 6

Will hydrojetting damage my pipes?

Accepted Answer

When performed by a trained technician using appropriate pressure settings for the pipe material and diameter, hydrojetting is safe for most residential and commercial drain piping including PVC, ABS, cast iron, and clay. The technician will assess pipe condition before jetting — if a camera inspection or the pipe's age and history suggest fragile or deteriorated sections, jetting pressure can be adjusted or a gentler mechanical method used instead. Hydrojetting is generally not recommended for pipes already known to have significant cracking, joint separation, or structural deterioration without a thorough inspection first.

Question 7

My drain keeps clogging with grease even after I have it cleared. What can I do?

Accepted Answer

Recurring grease clogs usually indicate one of three things: the previous clearing only punched through the center of the clog without cleaning the pipe walls, there is a structural issue such as a low-slope or sagging section that allows grease to pool, or the source of grease entering the drain has not changed. A thorough hydrojetting service that scours the full pipe bore rather than just opening a channel is the starting point. A camera inspection afterward can identify any sags, offsets, or buildup points that make the line particularly prone to re-clogging. On the source side, grease management practices — including proper grease trap maintenance — play a significant role in preventing rapid re-accumulation.

Question 8

Do I need a grease trap if I operate a commercial kitchen?

Accepted Answer

Most municipalities and local health or plumbing codes require grease interceptors or traps for any commercial food service operation that discharges grease-laden wastewater to the sanitary sewer system. The required capacity and type depend on your kitchen's size and output. Under-sink grease traps work for smaller operations but require frequent pumping, while in-ground interceptors handle higher volumes with longer intervals between pumping. If your facility does not currently have a code-compliant grease interceptor, Tandem Mechanical can evaluate your needs and install the appropriate system. Operating without a required interceptor can result in fines and liability for sewer line damage.

Grease Blockage Removal in Westfield, MA

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