New tub - chlorine consumption seems high?

[nbort]

I got my first hot tub up and running about a month ago and the base (no use) chlorine consumption seems really high compared to some of the comments that I am reading here. I have a new 275 gallon covered acrylic tub with continuous circulation and ozone. I am using the dichlor/bleach method. I purged with awwsome before filling the tub, hose off my filter once a week, dose with aqua clarity once a week, and haven’t added anything else to the tub except for a couple tsp of dry acid.

I dose with bleach up to 6-7 ppm and 24 hours later it will be down to <2. If I wait 36 hours, it will be down to zero. This doesn’t seem normal - is it? Should I reduce the duty cycle on the circulation/ozone? Unplug the ozone all together?

The water stays clear, I’m not getting any foam, the filter seems to stay clean and everything seems stable. It just seems like it’s consuming a lot of chlorine.

My other water parameters are:
CC <0.5
Ph 7.7
TA 60
CH 110
CYA 30

 

[Mdragger88]

Ozone is great & a helping hand to chlorine if you use the spa alot & it has bather waste to oxidize but once that is gone it oxidizes your fc as you have seen.
If you can reduce the settings start there. Not sure how yours can be set but if it could just run at the times you would actually be using the tub you would probably see the most benefit. If the tub rarely gets used you may wanna disconnect it.

Ozone Systems - Further Reading

www.troublefreepool.com

 

[nbort]

Thanks for the confirmation - I knew the ozone was eating chlorine but I had no idea how drastic it could be. I guess it makes sense that it might be particularly bad with a new unit running 24/7 in a relatively small tub.

I disconnected the ozone (electrically and pneumaticallly) and the UV (which was also plugged in to the ozone connector on the control board). Without those running 24/7, my standby chlorine consumption has dropped from about 5ppm/day to about 1.5 ppm/day. It’s so nice knowing that if I miss an evening check, there’ll still be chlorine in the tub come morning.