Case Study: Water Tank & Sump Cleaning in HSR Layout, Bangalore
Real job · Verified result · July 2026 · By Team LoklFix
Team LoklFix
LoklFix is Bangalore's waterproofing and home maintenance specialist. We've served 500+ homes across Bangalore using brand materials (Dr. Fixit, Fosroc, Asian Paints) with written 5–10 year warranties. Free on-site inspection for any waterproofing or tank cleaning problem. +91-8123083393
Service
Water Tank & Sump Cleaning
Area / Scope
8,000L underground sump
Total Cost
₹2,499
Material Used
UV sterilisation + food-grade disinfectant
Duration
4 hours
Warranty
N/A
The Problem
A family in an HSR Layout independent house contacted LoklFix after their children had recurring stomach issues. Their doctor had asked them to check their drinking water source. The family had not cleaned their underground sump in 18 months — they thought annual cleaning was sufficient. WhatsApp TDS reading before cleaning: 890 ppm (WHO safe limit for drinking water: 500 ppm).
Our Diagnosis
Visual inspection of the sump (after dewatering) found a 3-4 cm thick layer of grey-brown sludge on the floor and walls — the accumulated sediment from 18 months of borewell water supply. The sludge was supporting bacterial biofilm growth visible as a slick coating on the walls. The borewell water feeding the sump had 600 ppm base TDS — the additional 290 ppm above baseline was from concentrated dissolved solids in the sludge layer being redistributed into the water.
Key insight: This is why a proper diagnosis before quoting is essential. The right treatment for this job is completely different from what the previous contractors did — and the previous contractors weren't necessarily bad. They just didn't find the actual source before proposing a solution.
The Solution
Full 7-step process: dewater completely with submersible pump, manual scrubbing of walls and floor, high-pressure wash, food-grade disinfectant application (30-minute dwell time), clean water rinse, UV sterilisation of refilled water, TDS measurement and WhatsApp report with before/after readings.
The Result
Post-clean TDS: 180 ppm (borewell baseline after sludge removal). WhatsApp photo report sent within 2 hours of job completion showing empty clean sump and TDS meter readings. Family enrolled in 6-monthly cleaning AMC plan.
What This Job Cost — And Why
The total cost of ₹2,499 for this job breaks down as: 35–40% materials, 25–30% surface preparation and labour, 10–15% mobilisation and equipment. This is higher than the cheapest quotes the customer received — but it produced a permanent fix where two previous cheaper jobs had failed completely.
The framework for evaluating any waterproofing quote isn't price per sqft. It's: What is the contractor's diagnosis of the root cause? What preparation will they do? What material and how many coats? What does the written warranty cover? Get those four answers in writing before comparing quotes.
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