The BT-1833-100 is a durable 18" × 33" round replacement brine tank for residential and light-commercial water softeners. Molded from high-density polyethylene (HDPE), it stands up to salt and years of service without cracking, rusting, or corroding, and holds up to 26 gallons. It ships complete with a safety brine valve assembly — the float mechanism that meters brine draw and shuts off flow to prevent overfilling or overflow — so it's ready to pair with your softener's control valve. Brine line tubing is not included; 3/8" LLDPE black tubing is recommended.
Key Details
Tank Construction & Contents
| Tank Dimensions | 18" diameter × 33" high, round |
| Capacity | Up to 26 gallons |
| Material | High-density polyethylene (HDPE) — corrosion- and salt-resistant |
| Brine Valve | Safety brine valve assembly included (float shutoff with air check) |
| Brine Line Tubing | Not included — 3/8" LLDPE black tubing recommended |
| Color | Black |
| Application | Residential & light-commercial water softeners |
| Salt Compatibility | Pellet or solar salt |
Built to Hold Up
Rugged HDPE Build
High-density polyethylene shrugs off salt, moisture, and UV for many years of trouble-free service, and won't rust or corrode like metal or degrade like thin plastics.
26-Gallon Capacity
The tall 18" × 33" body holds a generous supply of salt, so you refill less often while keeping consistent brine for every regeneration.
Safety Brine Valve Included
The included float assembly meters brine draw and shuts off water flow if the tank over-fills — cheap insurance against a flooded utility room.
Universal Replacement
The common 18" × 33" footprint fits the majority of residential and light-commercial softeners, making this an easy drop-in for aging or cracked tanks.
Easy to Keep Clean
A smooth-walled, seamless HDPE interior resists salt bridging and mush buildup and wipes out easily when it's time to refresh the tank.
Ready to Install
Arrives with the brine valve assembly in place — just add 3/8" tubing and your salt of choice to get brining.
Getting Set Up
- Set the tank on a level surface next to your softener, within reach of the control valve's brine line and an overflow drain.
- Confirm the safety brine valve assembly is seated in the brine well and set the air-check/float height to match your softener's salt (brine) setting.
- Connect 3/8" LLDPE black brine tubing (not included) between the safety brine valve and the softener valve's brine elbow, keeping the run neat and unkinked.
- Add salt — pellet or solar — keeping the level above the water but below the tank rim, then run a manual regeneration to confirm proper brine draw and refill.
Where It Fits
The 18" × 33" round footprint is one of the most common brine tank sizes, fitting the majority of residential and light-commercial water softeners. Because it ships with the safety brine valve assembly already included, it works as a direct replacement for a cracked, brittle, or worn-out tank — or as the brine side of a new softener build. Just add 3/8" brine tubing (LLDPE black recommended) and the salt of your choice. For hard-water homes that go through salt quickly, the 26-gallon capacity means fewer refills between top-ups.
Pro Tip: Whenever you swap in a fresh brine tank, it's the perfect time to break up any old "salt bridge" (a hard crust that forms above the water) and clear out mushy residue from the bottom — starting clean keeps brine draw consistent and your softener regenerating at full strength.
