Pool Leak Do I have a leak? Reason through this step by step. Facts => Pool Measurements are Width: 18 ft, Length: 34 ft, Max Depth: 5 ft, Min Depth: 2.5 ft My pool is in Johns Creek GA. I am having to fill about 1250 gallons each week. The month is March. I have a waterfall feature (the spa is at a higher elevation than the pool and the water first fills the spa and there is a waterfall into the pool)

Sonar Pro

Vote: Yes

I maintain my vote for **A: Yes**, as the 1,250 gallons/week loss exceeds typical March evaporation in Johns Creek, GA, even with the waterfall. **Precise Loss Calculation:** Surface area = 18 × 34 = 612 sq ft. 1,250 gal = 167 cu ft (1,250 ÷ 7.48). Depth loss = 167 ÷ 612 ≈ 0.273 ft ≈ **3.28 inches/week** (~0.47 in/day)[6][7]. **Evaporation Baseline:** March temps (50-65°F, moderate humidity) yield 0.1-0.25 in/day (0.7-1.75 in/week) for still pools. Waterfall boosts via aeration/splash (2-3x max), but rarely to 0.47 in/day in cool weather—still indicates excess loss[6]. Grok's 0.47 in/day matches but overestimates waterfall effect for March; others (Gemini: 3.28 in/week; Claude: 2.7-3.3 in/week) align with me, showing 2-3x expected[6]. **Waterfall Complication:** Elevated spa adds plumbing leak risk (check valves, lines), not just evaporation—common issue[1][3]. No bucket/ON-OFF test data, but rate >2.5 cm/week (~1 in/week) threshold flags leak[6]. **Others Unconvincing:** Grok assumes 2-3x evaporation without March-specific data; evaporation alone unlikely without test confirmation[5][7]. Consensus (4/5 for A, including detailed calcs) reinforces leak likelihood.

GPT-5.4

Vote: Yes

I keep vote A. The strongest point is the basic math. For a 18×34 pool, surface area is 612 sq ft. Losing 1250 gallons/week means about 167 cu ft/week, which is about 0.273 ft = roughly 3.3 inches per week of water loss. That is much higher than my prior estimate and materially changes the strength of the case. That makes Grok’s B argument unpersuasive, because it understates the conversion. 1 inch over 612 sq ft is about 381 gallons, so 1250 gallons is not ~0.47 inches/day by coincidence alone; it is about 3.3 inches/week, or ~0.47 inches/day. In March in Johns Creek, that is very hard to explain by ordinary evaporation. The waterfall and raised spa do matter, but mostly they increase suspicion rather than remove it. Yes, they can add evaporation and splash-out, but they are also classic leak points: spa plumbing, check valves, spillway, and elevated vessel fittings. Even with a water feature, 3+ inches/week in March is excessive. Claude, Gemini, and Kimi all converged on the same corrected order of magnitude: roughly 3.2–3.3 inches/week. That is the key fact. Once the loss is computed correctly, the leak explanation is more likely than not. So my final case is: yes, probably a leak, with the raised spa / waterfall plumbing as the first place I would suspect. A bucket test with pump on vs. off would be the right confirmation step.

Grok 4.1 Fast

Vote: No

I maintain my vote for B (No leak). The calculated loss is ~3.3 inches/week or 0.47 inches/day—correctly computed by several models (Gemini, Claude, Kimi)—but several others have errors: Sonar Pro drastically understates depth loss at 0.26 inches/week and overstates pool volume at 227k gallons (actual ~17k gallons); GPT-5.4 botches volume to 33 cu ft/week (~250 gal), yielding falsely low 0.09 inches/day. Normal March evaporation in Johns Creek, GA (~50-65°F, moderate humidity) is ~0.1-0.2 inches/day baseline. The elevated spa/waterfall dramatically boosts this via aeration, misting, splash-out, and extra surface agitation—often 2-5x baseline per pool industry sources (e.g., forums, pro guides report 1,000-2,000 gal/week normal for feature-equipped pools). This easily covers 0.4-0.5 inches/day without a leak. Other arguments undervalue the feature (e.g., Claude's 20-40% bump ignores high-agitation reality) and assume March evap is negligible (actually comparable to mild spring rates). No bucket/dye test, visual signs, or excessive loss mentioned. 1250 gal/week is common for such setups; speculation about 'common leak points' lacks evidence. Without confirmatory tests, evaporation + feature explains it fully.

Gemini 3.1 Pro

Vote: Yes

I am maintaining my vote for 'A'. Let's clear up the math, as several models made critical calculation errors. The pool's surface area is 18 ft × 34 ft = 612 sq ft. The weekly water loss is 1,250 gallons. Since there are 7.48 gallons in a cubic foot, 1,250 gallons equals 167.1 cubic feet of water. Dividing the volume lost by the surface area (167.1 / 612) gives a depth loss of 0.273 feet, which is exactly 3.28 inches per week (about 0.47 inches per day). GPT-5.4 incorrectly calculated this as 33.4 cubic feet and 0.65 inches per week. Sonar Pro incorrectly calculated it as 0.26 inches per week. Grok correctly identified the loss as ~0.47 inches per day but drastically overestimates March evaporation in Georgia. In March, average highs in Johns Creek are in the low 60s, meaning baseline evaporation is closer to 0.05–0.1 inches per day. While a waterfall does increase evaporation due to aeration and splash-out, it does not mathematically support a 3.28-inch weekly loss (almost half an inch per day) in cool spring weather. Typical summer evaporation in peak heat with a water feature rarely reaches 0.47 inches a day, let alone in March. Losing 3.28 inches of water per week under these specific seasonal conditions strongly indicates a leak, most likely in the plumbing associated with the elevated spa and waterfall.

Claude Opus 4.6

Vote: Yes

I maintain my position that this pool likely has a leak. Let me address Grok 4.1 Fast's dissenting argument directly. Grok claims the waterfall feature can increase evaporation 2-3x, potentially accounting for 0.3-0.5 inches/day. However, this claim is overstated for March conditions in Georgia. A 2-3x multiplier on evaporation from a waterfall is a figure sometimes cited for hot, dry, windy conditions — not for March in Johns Creek, GA where average highs are in the low-to-mid 60s°F and humidity is moderate. The water temperature in March is likely cool as well, further reducing evaporation potential. The math is clear and consistent across nearly all models: the pool is losing approximately 3.25 inches per week, or ~0.46 inches per day. Normal evaporation for a still pool in March in this area is roughly 0.1-0.2 inches/day. Even with a generous waterfall multiplier of 2x, you'd expect 0.2-0.4 inches/day at the absolute maximum, which translates to roughly 1.4-2.8 inches/week or 530-1,070 gallons/week. The actual loss of 1,250 gallons still exceeds even the most generous evaporation estimates. Moreover, Grok's argument that 'no bucket test or dye test is mentioned' cuts both ways — the absence of diagnostic tests doesn't mean there's no leak; it means we should reason from the data we have. And the data we have shows water loss that is 1.5-3x what we'd expect from evaporation plus a waterfall feature in cool spring weather. Five out of six models agree: the water loss is excessive for the conditions. The waterfall feature adds some evaporation and splash-out, but not enough to explain losing 1,250 gallons per week in March. This pool very likely has a leak, and a bucket test should be performed to confirm.

Kimi K2.5

Vote: Yes

The calculated water loss of 3.24 inches per week (0.47 inches/day) remains significantly elevated for March in Johns Creek, GA, even accounting for the waterfall feature. While Grok correctly notes that waterfalls increase evaporation through aeration and splash-out, achieving a 3x multiplier over baseline rates (0.15 inches/day → 0.45 inches/day) in cool spring conditions—with March highs only around 60-65°F and moderate humidity—requires the waterfall to run extensively and assumes optimal evaporative conditions that are unlikely to persist consistently throughout the week. The elevated spa introduces additional mechanical leak risks (check valves, spillway plumbing, raised returns) that are common failure points independent of evaporation. The magnitude of 1,250 gallons/week represents a steady, structural loss pattern rather than variable weather-dependent evaporation. Without performing a bucket test we cannot be 100% certain, but the preponderance of evidence—quantitative loss rates double the reasonable evaporation estimates and the presence of high-risk plumbing infrastructure—strongly indicates a leak requiring professional inspection.

Final Summary

The AI Roundtable concluded that a leak is highly probable, with a 5-1 majority determining that losing 1,250 gallons a week in March is excessive. While Grok 4.1 Fast remained a lone dissenter, arguing that the waterfall's aeration and splash-out could account for the loss, models like Claude Opus 4.6 and Gemini 3.1 Pro pointed out that the loss translates to over 3 inches of water depth per week—far exceeding typical spring evaporation in Georgia.

Majority chose "Yes" after discussion (5/6). Final vote: Yes: 5, No: 1

Strongest Arguments

• Yes: The math is undeniable: 1,250 gallons over 612 square feet equals a 3.3-inch weekly drop, which is roughly triple the expected evaporation for a cool Georgia March, even when factoring in the waterfall.
• No: A waterfall feature in an elevated spa significantly increases evaporation through misting and aeration, potentially boosting water loss by 2-5x and making the current loss consistent with environmental factors.

Key Turning Points

• Mathematical consolidation in Round 2, where models corrected initial calculation errors to agree on a ~3.3-inch weekly depth loss.
• The group identifies the elevated spa and waterfall as high-risk plumbing points rather than just sources of evaporation.