Jacuzzi J-355
Quick answer
The Jacuzzi J-355 holds about 400 gallons of water and measures 84 x 91 x 38 inches, seating up to 6. Full of water and people it weighs roughly 5,282 lb.
- Water volume400 gal
- TypeHard-shell
- Dimensions (in)84 x 91 x 38
- Seats6
- Water weight3,336 lb
- Empty weight836 lb
Chemical doses for about 400 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 | 0.96 oz |
| Raise free chlorine +3 ppm | dichlor granules | 0.29 oz |
| Raise bromine +3 ppm | bromine granules | 0.27 oz |
| Chlorine shock (+10 ppm) | dichlor | 0.95 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.
As an Amazon Associate this site earns from qualifying purchases. Shopping links are affiliate links and cost you nothing extra.
How much does a full J-355 weigh?
Empty, the JacuzziJ-355 weighs about 836 lb. Its 400 gallons of water add about 3,336 lb, and 6 bathers add roughly 1,110 lb more, for a loaded total near 5,282 lb. Make sure your deck or pad is rated for it. Work out any tub on the filled weight calculator.
Keep the water right
A 400 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 400 gallon figure is from the manufacturer's published specification: jacuzzipartners.com. Manufacturer handbook. Average fill 400 gal; full spa volume 490 gal. Seats 5-6. Capacities vary with how high you fill and with seats and footwell; confirm against your own manual or a metered fill when precision matters.