How it works
On demand, one batch at a time, from a salt load that lasts.
A conventional setup keeps mixed seawater standing in a barrel: you mix a large volume in advance, it takes up a corner of the room, and you draw it down over days or weeks. SeaPrep inverts that. The salt stays dry until you ask for a batch.
A batch runs as a closed sequence: intake, dosing, mixing, measurement, correction, acceptance, controlled output. A batch that measures outside the accepted band is not released. The loop corrects it and measures again.
So between batches the machine holds no seawater at all. It holds salt, and one load covers many batches.
- 35.0
- Target salinity, PSU
- ±0.5
- Accepted batch tolerance, PSU
- 1
- Salt load, many batches
What is not shown here: the internal water circuit. The layout of chambers, pumps and valves is not published. That is deliberate, not a gap we mean to fill later.
Related questions
Does SeaPrep replace my mixing barrel?
Yes. SeaPrep stores dry salt and prepares seawater one batch at a time, so there is no need to keep a barrel of mixed saltwater standing in the room.
It is not a stirring station bolted onto a barrel. The salt goes in dry, and each batch is dosed, mixed, measured and corrected before it is released.
How much seawater does the unit hold?
None, by design. 20 L and 85 L are working chamber volumes — the size of one batch — not stored seawater.
Seawater is prepared when you ask for it. One salt load covers many batches: approximately 240 L on the 20 L, over 1,000 L on the 85 L Pro.
Can it do automatic water changes on its own?
SeaPrep prepares seawater and signals when a batch is ready. Orchestrating a water change — deciding when, and moving the water — is what YuzhaLink does.
The boundary is deliberate and it is an interface: SeaPrep exposes a Ready output and accepts a Deliver Request input. Water is delivered only when Ready, Deliver Request and the local safety permit all agree.
