Measured for your tub. Adjusted as you go.
A few simple inputs. A fairly precise estimate.
Most chemical kits assume every tub is the same. Ovastra starts with what makes yours different: its size, your sanitizer, your water, how often you soak and the season. From that, our adaptive model estimates how much of each chemical you'll use, and refines the estimate over time.
Tell us about your tub
Size, model, sanitizer type and how often you soak. A few simple answers, no lab work.
We estimate your usage
Our adaptive model works out, fairly precisely, how much of each chemical your tub will go through.
Pre-measured packets arrive
Flat, single-dose sachets, color coded so you always know which one goes in next.
It keeps adjusting
As your habits and seasons change, the estimate updates, and we charge the card on file for what you'll actually use.
One packet, one dose.
Flat, single-dose sachets in four colors. No measuring cups, no guessing, no half-used buckets in the garage.
Sanitizer, Shock, Balance and Hardness. Packaging shown is a pre-production mockup.
Sanitizer
The everyday dose that keeps germs in check between soaks.
Shock
A periodic boost that clears out what builds up after heavy use.
Balance
Keeps pH and alkalinity where your sanitizer works best and your skin stays comfortable.
Hardness
Keeps calcium in range to protect the heater, pump and shell.
Pay for what your tub uses.
Because the model knows roughly how much you'll need, we charge the card on file for that amount, not a flat fee for a box that's too big or too small. Pause, change or cancel anytime.
See your routine in two minutes.
Answer a few questions and the calculator builds the dosing schedule for your tub.
Open the calculator