Buy the 4L container once
One HDPE gallon jug per chemistry — Alkalinity, Calcium, Magnesium. Built to last indefinitely. Integrated 4mm dosing barb connects directly to any peristaltic pump. Color-coded caps so the wrong hose never goes in the wrong jug.
Subscribe to 4-packet refill bundles
When your jug runs low, a fresh 4-pack ships automatically. Each packet is pre-measured to dissolve into exactly 1 L of RO/DI water. Mix four into your jug, shake, and you're dosed for the month. Same ICP-verified chemistry — just four times the volume per mix session.
One pour, a month of stock
Serious reefers don't want to mix weekly. The 4L format gives you a full month of buffered stock solution per chemistry — sized for high-demand SPS tanks, large display systems, or anyone who'd rather spend time watching their reef than prepping chemistry.
Every batch still ICP-verified
Bulk format, same standard. Every packet in every 4-pack ships from a verified batch. Scan the QR on any packet to pull the full Reef Labs ICP-OES report — lead, mercury, arsenic, the full heavy metals panel — before it goes in your tank.
