Brine Tank Asm. 18x40 Black w/2310 S

For homes that want both extra salt capacity and dual protection, the Nelsen 18" x 40" Round Black Brine Tank Assembly with a Fleck 2310 brine safety valve and 500 air check is a complete, install-ready solution. The taller 40-inch tank holds more softener salt than a standard 18x33 unit, while the black polyethylene build resists corrosion through years of salt exposure. Shipping as a matched assembly, it streamlines installation and avoids fitment headaches.

This configuration combines two safeguards that cover the most common brine-tank concerns. The Fleck 2310 brine safety valve automatically stops brine fill to prevent overflow, and the 500 air check seals the brine line at the end of the draw so air doesn't reach the resin bed. Together they keep regenerations consistent and protect against both salt-water spills and the waterlogging that degrades softening performance.

• Round black polyethylene brine tank with cover
• 4" brine well with cap
• Fleck 2310 brine safety valve for overflow protection
• 500 air check to keep air out of the resin tank
• Brine overflow elbow and connecting tubing

The taller 18x40 footprint is ideal when you want to extend the time between salt refills without widening the tank's footprint on the floor. Because the brine tank stores the salt that dissolves into the concentrated brine used to recharge the resin, a watertight, properly equipped tank is essential to softening performance. Maintain yours by keeping salt above the water line, breaking up any salt bridge, and rinsing out sediment periodically. The black finish keeps it looking sharp in any utility space. Offered by Water Softener Plus on the proven Nelsen platform, this assembly pairs with most standard residential softener valves.

A few additional details help you get the most from this unit. Brine tanks like this one work hand in hand with the resin tank: while the resin captures hardness ions during normal service, the brine tank supplies the salt solution that strips those ions away during regeneration, returning the bed to full capacity. Sizing the tank to your salt-use habits and softener grain rating helps avoid frequent refills, and using clean, high-purity softener salt reduces sediment buildup while keeping the safety float and brine line clear.