# Seaweed - Stage 4 (technology)

internal name `seaweed-mk04` · tier 7 (Production science pack, [tier 7](https://factorio.kalzumeus.com/tier/7.md))
HTML page: https://factorio.kalzumeus.com/tech/seaweed-mk04/

## Cost

2500 units of (1 × [Production science pack](https://factorio.kalzumeus.com/item/production-science-pack.md), 2 × [pY science pack 3](https://factorio.kalzumeus.com/item/py-science-pack-3.md), 3 × [Chemical science pack](https://factorio.kalzumeus.com/item/chemical-science-pack.md), 6 × [pY science pack 2](https://factorio.kalzumeus.com/item/py-science-pack-2.md), 10 × [Logistic science pack](https://factorio.kalzumeus.com/item/logistic-science-pack.md), 20 × [pY science pack 1](https://factorio.kalzumeus.com/item/py-science-pack-1.md), 30 × [Automation science pack](https://factorio.kalzumeus.com/item/automation-science-pack.md), 6 × [Military science pack](https://factorio.kalzumeus.com/item/military-science-pack.md)), 300 s each.

## Requires (2)

- [Nano mesh](https://factorio.kalzumeus.com/tech/nano-mesh.md)
- [Seaweed - Stage 3](https://factorio.kalzumeus.com/tech/seaweed-mk03.md)

## Leads to (1)

- [Seaweed - Stage 5](https://factorio.kalzumeus.com/tech/seaweed-mk05.md)

## Unlocks (2 recipes)

### Seaweed (`seaweed-4`)

- 20 s · tier 7 · productivity modules allowed
- Ingredients: 100 × [Saline water](https://factorio.kalzumeus.com/fluid/water-saline.md), 100 × [Carbon dioxide](https://factorio.kalzumeus.com/fluid/carbon-dioxide.md), 100 × [Slaked lime](https://factorio.kalzumeus.com/fluid/slacked-lime.md), 1 × [Fertilizer](https://factorio.kalzumeus.com/item/fertilizer.md), 3 × [Iron ore dust](https://factorio.kalzumeus.com/item/iron-ore-dust.md)
- Results: 60 × [Seaweed](https://factorio.kalzumeus.com/item/seaweed.md)
- Made in: Seaweed crop facility MK 01, Seaweed crop facility MK 02, Seaweed crop facility MK 03, Seaweed crop facility MK 04
- Unlocked by: [Seaweed - Stage 4](https://factorio.kalzumeus.com/tech/seaweed-mk04.md)

### Seaweed MK 04 (`seaweed-mk04`)

- 25 s · tier 7
- Ingredients: 200 × [Slaked lime](https://factorio.kalzumeus.com/fluid/slacked-lime.md), 15 × [Molybdenum trioxide (MoO3)](https://factorio.kalzumeus.com/item/molybdenum-oxide.md), 1 × [Fertilizer](https://factorio.kalzumeus.com/item/fertilizer.md), 5 × [Seaweed MK 03](https://factorio.kalzumeus.com/item/seaweed-mk03.md), 5 × [Crude Salt](https://factorio.kalzumeus.com/item/crude-salt.md), 75 × [Clean Organic Pulp](https://factorio.kalzumeus.com/fluid/clean-organic-pulp.md)
- Results: 1 × [Seaweed MK 04](https://factorio.kalzumeus.com/item/seaweed-mk04.md)
- Made in: Seaweed crop facility MK 01, Seaweed crop facility MK 02, Seaweed crop facility MK 03, Seaweed crop facility MK 04
- Unlocked by: [Seaweed - Stage 4](https://factorio.kalzumeus.com/tech/seaweed-mk04.md)