What If Fc Is Zero With Cd Ozonator Happens?

[pkillur]

So, while I was out of town my wife and her best friend used the hot tub and they forgot to add chlorine, so when I tested the water today FC was zero. Do I need to jack up the FC to like 6-10? I have a CD ozonator hooked into the circ pump, so it's on 24/7, but I'm not really quite sure how / what to do. I boosted it up to 4 PPM FC last night.

Am I significantly better off since I'm on an ozonator? It's pretty hearty, my CD is something around 30-40 % on a practically new filter.

My thought is to test tonight and see what it's at, but do I need to super-shock and let the tub settle?

[Mikey_in_NY]

So, while I was out of town my wife and her best friend used the hot tub and they forgot to add chlorine, so when I tested the water today FC was zero. Do I need to jack up the FC to like 6-10? I have a CD ozonator hooked into the circ pump, so it's on 24/7, but I'm not really quite sure how / what to do. I boosted it up to 4 PPM FC last night.

Am I significantly better off since I'm on an ozonator? It's pretty hearty, my CD is something around 30-40 % on a practically new filter.

My thought is to test tonight and see what it's at, but do I need to super-shock and let the tub settle?

If you're still reading some FC tonight then you probably don't need to shock. If it's at zero then, yes, try shocking at 10 PPM.

[chem geek]

I'd probably shock to a fairly high level just in case any biofilms were formed on tub surfaces. Ozone will keep the water clear and kill anything circulating, but it doesn't provide a residual disinfectant in the bulk water so won't do much for anything stuck on spa surfaces. You're probably OK, but to be safe, I would shock just in case. If you were a person with a sensitive immune systems, then you'd want to decontaminate the tub, but your risk sounds low. As was implied in the previous post, if your CD is still low, then you probably don't have significant biofilms. You can also check the feel of your spa surfaces to see if any of them feel slimy rather than the more normal squeaky clean feel.

[pkillur]

I'd probably shock to a fairly high level just in case any biofilms were formed on tub surfaces. Ozone will keep the water clear and kill anything circulating, but it doesn't provide a residual disinfectant in the bulk water so won't do much for anything stuck on spa surfaces. You're probably OK, but to be safe, I would shock just in case. If you were a person with a sensitive immune systems, then you'd want to decontaminate the tub, but your risk sounds low. As was implied in the previous post, if your CD is still low, then you probably don't have significant biofilms. You can also check the feel of your spa surfaces to see if any of them feel slimy rather than the more normal squeaky clean feel.

Will check tonight - didn't think to check the side of the tub.

Thanks!