Enter test results
Bromine 2–4 ppm
pH 7.4–7.6
Total alkalinity 120–150 ppm
Calcium hardness 100–200 ppm
Phosphate 0–125 ppb
TDS <1500
Water targets
Bromine
2–4
ppm
pH
7.4–7.6
Alkalinity
120–150
ppm
Hardness
100–200
ppm
Phosphate
0–125
ppb
TDS
<1500
ppm
Maintenance schedule
After each use
2 tbsp SpaGuard Brominating Concentrate
Jets on 15 min · cover off 30 min
Weekly
1 tbsp Water Clarifier + 3 tbsp Stain & Scale + ½ cup Enzyme
Test strips: bromine and pH. Adjust only if out of range.
Every 4 weeks
Replace FROG Serene bromine cartridge
Rinse filter with hose
Every 4 months
Replace FROG Serene mineral cartridge
Deep clean or replace filter · professional water test
Every 3–4 months
Full drain and refill
Ahh-Some pipe purge first · hose pre-filter on refill
Spa profile
Brand
Marquis Euphoria
Marquis Euphoria
Volume
400 US gallons
400 US gallons
System
FROG Serene in-line (bromine + mineral cartridges)
FROG Serene in-line (bromine + mineral cartridges)
Products
SpaGuard / BioGuard line
SpaGuard / BioGuard line
AI assistant key
The "Ask the spa" tab uses your Anthropic API key. Stored only on this device.
Add to home screen
On iPhone: tap the Share button in Safari → "Add to Home Screen."
The app appears on your home screen like any native app — no App Store required.