The Wongs' 12-year-old 1,000L poly tank had developed a hairline stress crack near the base and was weeping into the rooftop slab. The crack was patch-able but the tank was already past its expected life in Malaysian sun. The household had grown — they wanted 50% more capacity and a level controller so the booster pump wouldn't dry-run if the tank emptied during a mains outage.
We sized up to 1,500L based on their 5-person household and 24-hour backup target. Switched material from poly to 304 stainless for double the service life. Re-engineered the galvanised frame to take the heavier full-fill load. Re-routed the overflow pipe properly away from the AC compressor pad (the original install had dumped overflow straight onto it). Added a SQFlex level controller that cuts the booster pump if the tank drops below 15% — protects the pump on long mains outages.
Job took 2 working days from old-tank removal to first fill. Pressure to the upstairs bathrooms improved noticeably because the new tank sits 30cm higher than the old one. Booster pump cycling has stopped entirely — the new tank's volume buffers daily demand properly. Six-month follow-up: tank dry, no overflow events, family happy.
They asked the right questions before we bought anything. How many people, how often does the mains drop out, do you mind paying more upfront for longer life. Made the choice clear. Two days from start to finish and we haven't thought about the tank since. — Wong, Bukit Jelutong
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