Bestway / Lay-Z-Spa Helsinki AirJet (5-7 person)
Quick answer
The Bestway / Lay-Z-Spa Helsinki AirJet (5-7 person) holds about 297 gallons of water and measures 71 dia x 26 H inches, seating up to 7. Full of water and people it weighs roughly 3,847 lb.
- Water volume297 gal
- TypeInflatable
- Dimensions (in)71 dia x 26 H
- Seats7
- Water weight2,477 lb
Chemical doses for about 297 gallons
Computed for this tub's water volume, so you can dose without doing the arithmetic. Amounts are ounces by weight.
| To do this | Chemical | Amount |
|---|---|---|
| Raise total alkalinity +10 ppm | sodium bicarbonate | 0.71 oz |
| Raise free chlorine +3 ppm | dichlor granules | 0.21 oz |
| Raise bromine +3 ppm | bromine granules | 0.20 oz |
| Chlorine shock (+10 ppm) | dichlor | 0.71 oz |
Open the dosing calculator for this tub
Add in small steps with the pump running, wait, then retest before adding more. Never mix chemicals together, and always follow your product label, which wins over any calculator.
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How much does a full Helsinki AirJet (5-7 person) weigh?
Its 297 gallons of water alone weigh about 2,477 lb. The tub itself is light (roughly 50 to 90 lb), so filled with water and 7 bathers it lands near 3,847 lb, almost all of it water. Either way, the water is the heavy part. Work out any tub on the filled weight calculator.
Keep the water right
A 297 gallon tub doses in small amounts, so a kitchen scale and small additions beat eyeballing it. Test, balance alkalinity then pH then sanitizer, and use the dosing calculator sized for this tub. Start with test strips and a chemical kit.
Source
The 297 gallon figure is from the manufacturer's published specification: www.bestwaycorp.com.au. Bestway official (AU) spec: 1,123 L (297 gal.) at 80% fill; 71x26 round, 67in inner dia. Also on lay-z-spa.co.uk. Capacities vary with how high you fill and with seats and footwell; confirm against your own manual or a metered fill when precision matters.