Low water level causes cavitation?

[blofquist]

We have a South Seas Spa it is a 746L. Bought it in May 2011. Around 360 gallons. The spa has a real sensitivity to water level. If the water level drops near the top of the bezel of the uppermost jet (about 7" from top of spa) the spa will cavitate when I get out. Not sure that is the right term. Significant amount of air cycling through the basket. Adding water solves the problem for awhile. I have checked for leaks and not found any. I am the only user, for or five times a week. I have had hot tubs in the past and never had this problem. Wanted to see if it was normal or if there is something I need to take care of.

Thanks in advance.

 

[Jimrahbe]

b,

Welcome to TFP... A great place to find the answers to all your Spa questions...

My Spa works exactly the same way.. If the water level gets below one of the jets it will start to "spit" water and air...

My problem was the amount of water I lost due to evaporation.. My spa cover had a bowl in the middle, which captured rain water.. I put pool noodles under one side, which allowed the rain to run off, but also increased my evaporation rate. Replacing the cover fixed by evaporation issue..

I moved this thread to Spas section where it might get the right viewers...

Thanks for posting,

Jim R.

 

[blofquist]

Thank you for the response. the problem is that the water level is still above the top of the upper jets. Water is note spitting out of the jets. Air is cavitating through the basket. IT happened again tonight.

 

[duraleigh]

Cavitation is a different animal. You have a suction side air leak. Check out the article in Pool School.