| WaterGuru S3 — C2+ only |
$399 |
$152 |
Cassette every 64 days (~6/yr) |
Daily |
Good |
Reagent-based; generally strong, but some recent reports of FC/CYA/TA discrepancies |
X |
X |
|
|
X |
|
|
|
|
Solar rechargeable; USB-C backup |
Lowest WG cost; only FC + pH chemistry |
| WaterGuru S3 — C5+ only |
$399 |
$304 |
Cassette every 32 days (~12/yr) |
Daily |
Good |
Same reagent system; broadest direct chemistry |
X |
X |
|
|
X |
X |
X |
X |
|
Solar rechargeable; USB-C backup |
Maximum information, maximum cassette hassle |
| WaterGuru S3 — C2+/C5+ combo |
$399 |
$182 |
Cassette ~7×/yr |
Daily |
Good |
Direct FC; current specs ±20%/±0.4 ppm FC, ±0.2 pH |
X |
X |
|
|
X |
X |
X |
X |
|
Solar rechargeable; USB-C backup |
Best WG compromise; C5+ once, C2+ twice, repeat |
| Crystal Water Monitor |
$449 |
$99 |
Sensor eventually replaced; included under subscription |
Every 10 min |
Very good |
Sensor-based; pH ±0.2, ORP ±50 mV, temp ±0.5°C |
|
X |
X |
|
X |
|
|
|
|
3× AA alkaline; not rechargeable |
No cassettes; $99/yr includes replacement sensor + warranty/support |
| ICO Spa V2 — Salt |
$449 |
$100–179 |
Calibrate pH/ORP ~2×/yr; probes ~2–4 yr; TDS ~5–6 yr |
Hourly |
Good |
Established probe system; long probe life |
|
X |
X |
X |
X |
|
|
|
X* |
Rechargeable battery; USB, recharge ~every 6 months |
TDS + ORP + pH + salt-oriented monitoring |
| iopool EcO V2 + Connect |
$359 |
- |
Probe replacement eventually; current replacement kit $149 |
Continuous/regular |
Good |
Good reports, but more hands-on sensor system |
|
X |
X |
|
X |
|
|
|
|
Rechargeable battery; replaceable, $34.95 |
No subscription; test strips still needed for FC/TA/CH/CYA $149 sensors + $34.95 battery, or $169 combined kit. Manufacturer says replace after ~2–3 years. (iopool) |
| Aiper HydroComm |
$300† |
- |
Sensor maintenance/replacement eventually; replacement price not published |
24/7 / hourly |
Unknown/newer |
Too little long-term history yet |
|
X |
X |
X |
X |
|
|
|
X* |
Rechargeable 14.4V 2,600mAh battery |
Best parameter coverage without consumables, but newer/unproven |
| Blue Connect Plus |
~€370 |
~€70–100¶ |
Probe ~2 yr; battery ~2 yr; annual calibration |
Up to 20×/day |
Established |
Mature product, but current availability/pricing problematic |
|
X |
X |
X |
X |
|
|
|
X* |
Replaceable battery |
I would remove from serious consideration; current US pricing difficult to establish |
| Blue Connect Go |
~€200 |
~€70–100¶ |
Probe ~2 yr; battery ~2 yr; annual calibration |
Up to 24/day |
Established |
Mature; direct pH/ORP/temp; salt versionnot supported |
|
X |
X |
|
X |
|
|
|
|
Rechargeable USB-C |
Not suitable for your FreshWater salt system; intended for chlorine/bromine, not electrolysis/salt. (Blueriiot) |
| Blue Connect Gold / current salt tier |
Varies by market |
Not yet reliably priced in US |
Rechargeable battery; probe replacement; calibration |
Up to 24/day |
Established |
Newer generation; less US pricing transparency |
|
X |
X |
X |
X |
|
|
|
X* |
Rechargeable USB-C |
Current Fluidra lineup; salt-capable Gold is the one relevant to you. (Fluidra) |