I own a 2013 grandee from hot spring spas,
It sat all last winter and this summer empty with rv anti freeze to prevent it from freezing up till we got our house built. It built up a gross alge that took forever to get washed out.
Filled the hot tub after I got it cleaned out using just hot water .
Water sample pH and alk. Are thru the roofs.... I have gone thru a whole container and a half of leisure time "spa down"
Everyone I run the Jets this is what happens. .. pH anf alk are still high ....20151128_150037.jpg
Should I just drain and refill?
Or is there something else?