This same thing happened to me but worse my pump won't stay running now and keeps tripping the reset on the plug. I fear I ruined it.The pump trips the reset circuit after about 5 min my guess is it's overworked due to the scale. I purchased Seaklear and just put it in and ran pump as long as it would go which was 5 min the jets did expel alot of scale. I will let it sit awhile but please what are thoughts?