ATO / Dosing · IceCap

IceCap Freshwater ATO Reservoir (5 Gallon) fit check

Quick answer

IceCap Freshwater ATO Reservoir (5 Gallon) is an ATO reservoir from IceCap. Listed features: Fully enclosed acrylic top-off reservoir (minimizes evaporation/dust); Twin 1/4 inch quick-connect fittings for ATO and kalkwasser feed; Built-in 1/4 inch RO float valve for auto-refill from RODI.

IceCap Freshwater ATO Reservoir (5 Gallon): fits roughly 20-150 gallon systems. Specs, compatibility math, sizing risks, and alternatives before you buy.

Check this in my build Compare ato / dosing

Who it is for

Good fit for

✓ 20-150 gallon systems, per the catalog fit range.
✓ Small or open-top tanks where daily evaporation swings salinity fastest.

Not a fit for

✕ Tanks under about 20 gallons; it is sized above them.
✕ Systems over about 150 gallons without adding capacity elsewhere.
✕ Builds that have not yet decided on reservoir placement and pump lift.

Listed features

Fully enclosed acrylic top-off reservoir (minimizes evaporation/dust)
Twin 1/4 inch quick-connect fittings for ATO and kalkwasser feed
Built-in 1/4 inch RO float valve for auto-refill from RODI
Micro-dosing line for testers such as HYDROS Maven
Large lidded service opening

Specs checked against coralvue.com.

Compatibility math

Build role

gear value = risk reduced + maintenance made easier + build fit

Example: IceCap Freshwater ATO Reservoir (5 Gallon) belongs in the plan only if it solves a real stability or maintenance job.

ReefCrafter keeps optional upgrades behind core stability requirements.

Risk notes

Manual top-off works until a busy week turns evaporation into a salinity spike.

Professional fit context

Check sensor redundancy, reservoir size, pump lift, fail-safes, and whether dosing is needed yet.
IceCap Freshwater ATO Reservoir (5 Gallon) fits roughly 20-150 gallon systems; confirm that range against the final display volume, sump volume, and livestock plan.

Alternatives to compare

IceCap ATO EZ Automatic Top-Off System
Catalog fit range 5-200 gallon systems (balanced tier).
Innovative Marine HydroFill Ti ATO Controller
Catalog fit range 5-200 gallon systems (balanced tier).
Innovative Marine HydroFill Ti ATO Water Pump
Catalog fit range 5-200 gallon systems (balanced tier).

Full spec snapshot

Category: ATO / Dosing
Build tier: Balanced
Estimated price: $127
Tank fit range: fits roughly 20-150 gallon systems
Format: ATO Reservoir

Questions

What tank size is the IceCap Freshwater ATO Reservoir (5 Gallon) for?

ReefCrafter's catalog fit range for it is 20-150 gallon systems. Confirm that against your final display volume, sump volume, and livestock plan rather than the box label alone.

What should I compare the IceCap Freshwater ATO Reservoir (5 Gallon) against?

IceCap ATO EZ Automatic Top-Off System (Catalog fit range 5-200 gallon systems (balanced tier)); Innovative Marine HydroFill Ti ATO Controller (Catalog fit range 5-200 gallon systems (balanced tier)); Innovative Marine HydroFill Ti ATO Water Pump (Catalog fit range 5-200 gallon systems (balanced tier)).