The cost to fill a swim spa varies based on several factors, including the size of the swim spa, the local cost of water, and whether there are any additional fees or charges from your water utility provider.

Here are some steps to help you estimate the cost:

 

Determine the Volume:

First, find out the capacity of your swim spa.

Swim spas can range from about 1,500 to 2,500 gallons/litres, but this can vary widely depending on the model.

Manufacturer's will be able to provide this on the product specification sheet.

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Check Local Water Rates:

Contact your local water supplier or check your water bill to find out the cost per gallon or per cubic foot of water.

Rates can vary significantly, but a common cost might be around £0.002 to £0.010 per gallon/litre.

Calculate the Cost:

Multiply the number of gallons/litres needed for your swim spa by your local water rate.

For example, if your swim spa requires 2,000 gallons/litres and your water rate is £0.005 per gallon/litre, the cost to fill it would be 2,000 gallons/litres × £0.005/gallon/litre = £10.

Here is the link to calculate the the cost of filling your swim spa: Click here for your cost calcualtion

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Additional Costs:

Remember, additional fees or costs in pricing might apply once you've used a certain amount of water.

Check if filling the hot tub will move you into a higher rate, especially if you are on a water meter.

Consider Wastewater Fees: Some local councils charge for sewage based on water usage, so this could add to the cost if applicable.

Keep in mind that while the initial fill might involve a significant amount of water, you'll only need to fully replace the water periodically (around every three to six months, depending on use and maintenance).

Regularly balancing the water chemistry and using filtration systems effectively can help maintain water quality and reduce the need for frequent refills.

NOTE: It would be savvy to invest in a swim spa that had advanced water management (sanitation and filtration).

This would significantly reduce the amount of times/volume of water that you would have to empty from your swim spa.