---
title: "Trade effluent: the overlooked P&L line for commercial laundries"
description: Optimise your laundry's trade effluent management with practical tips on dosing, temperature control, and pH balancing to save costs and ensure compliance.
---

[Troo | Blog & Resources ](https://www.troocost.com/blog)

# [Trade effluent: the overlooked P&L line for commercial laundries](https://www.troocost.com/blog/trade-effluent-the-overlooked-pl-line-for-commercial-laundries)

 Written by [Stephanie Beadling](https://www.troocost.com/blog/author/stephanie-beadling) | Feb 9, 2026 11:49:17 AM

#### You’ve got machines to keep running, deadlines to hit and customers who need spotless results. Then a water bill lands that’s higher than expected, or a consent warning drops into your inbox. Stress rises.

Trade effluent often sits on the P&L with little attention, yet small process changes can steady both spend and compliance.

### **What the Mogden formula really means**

Trade effluent charges are typically calculated using the Mogden formula or a reasonable variant**. **The idea is simple:

For charging, ‘strength’ is commonly represented by COD and suspended solids, with other parameters controlled via your consent:

Higher volume and higher strength mean a higher bill. Your consent will also set limits for temperature, pH and other measures. Breaches can lead to surcharges or enforcement, so control matters.

### **Why dosing, temperature and pH change what you pay**

#### **Dosing**

Get the chemistry wrong and costs creep up.

**What to do:** tie dosing to load weight and soil type. Keep simple set points that operators can see and check them regularly. Run quick jar tests with your chemical partner to make sure the mix is doing its job without excess.

#### **Temperature**

Many consents cap discharge temperature around the low-40s°C. Hotter flows can damage pipes and are a safety risk, which can trigger action from your water company.

**What to do:** cool before discharge. A balance tank lets hot and cooler streams mix to a safe level. If you can add heat recovery to pre-warm incoming water, you’ll cool the effluent while saving energy on the wash line.

#### **pH**

Most consents set a range (often roughly pH 6 to 10 or 11).Outside that, treatment works less well and corrosion risk rises. pH swings also upset any on-site settlement step, which can raise solids on your samples.

**What to do:** fit a reliable online pH probe where flows combine, link it to an alarm, and keep spare buffer solution for quick checks. If you dose acid or alkali, add interlocks so the plant pauses if pH drifts out of range.

### **Make the bill more predictable with a few practical moves**

These steps don’t need big projects. They focus on control, evidence and ease for your team.

### **What “good” looks like**

On well-run sites, effluent control feels routine. Operators know the set points. Dosing tracks the load. pH and temperature sit inside limits with live readouts. The lint screen is clean. Samples look similar from week to week. Bills match what the data suggests. Most importantly, managers sleep better because compliance doesn’t hinge on one person’s memory.

### **Need help with trade effluent or anything water?**

Get clear, practical advice on Mogden charging, consents and simple plant controls. [Complete this form](https://share-eu1.hsforms.com/1fohChHidQ52t8I35v4nI4wfvggo) and a water expert will be in touch to discuss options that fit your site and workload.

[View full post](https://www.troocost.com/blog/trade-effluent-the-overlooked-pl-line-for-commercial-laundries)

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