Hydrostatic checks
Hydrostatic and groundwater assessment
The most expensive pool failures involve water under the shell, not in it. High groundwater exerts hydrostatic pressure that can crack floors and, when a pool is drained without precautions, lift an entire shell out of the ground. Assessment establishes the groundwater picture, checks the hydrostatic valve is functional, and determines whether, and how, the pool can be safely emptied for any proposed repair.
Scope
What this covers
Groundwater level evaluation via the main drain sump and site history
Hydrostatic valve function check and replacement recommendation if seized
Drain-down planning with staged water levels and standing time limits
Advice on relief points and dewatering where repairs require an empty shell
Post-repair refill sequencing to rebalance loads on the structure
Timing
When it's needed
Essential before any full drain-down, on low-lying or bad-drainage blocks, after floods, and where a floor crack appeared during or soon after a previous emptying. Sydney's wet years have floated pools on blocks whose owners never suspected a groundwater issue existed.
Never fully drain a pool without a groundwater and hydrostatic assessment, shells can lift out of the ground under external water pressure. Isolate power at the switchboard before anyone touches a pool light or its niche, and keep children away from partially drained pools and open excavations during repairs.
Quote variables
What shapes the scope
Site drainage, topography and season: groundwater is a moving target
Shell type and weight, since fibreglass floats far more readily than concrete
Whether the proposed repair genuinely requires an empty pool at all
Dewatering equipment and discharge arrangements if levels are high
Pool repairs cross several licensed trades in NSW: plumbing work on pool pipework requires a licensed plumber, electrical work at lights and equipment requires a licensed electrician, and structural or building work above prescribed values requires an appropriately licensed contractor under NSW Fair Trading rules. Ask which licence covers each part of your quote and verify it before work begins.
Detection and repair services
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