The Chem-Tainer 325 Gallon Open Top Batch Storage Tank is a tall, narrow cylindrical vessel built for mixing, batching, and bulk water storage where a removable top and direct top access matter more than a sealed lid. It stands 74 inches tall on a compact 36 x 36 inch footprint and holds 325 gallons in natural white polyethylene. The open top lets you pour, blend, and inspect contents directly, and the tight footprint slots it into pump rooms, batch stations, and equipment pads where floor space is the constraint. If you are shopping open top tanks or a white open top storage tank for a batch line, the geometry here is the reason to choose it.
Will this open top tank work for your job?
Plan around the loaded weight, not the empty shell. The full envelope is 74 in H x 36 in W x 36 in L, with a 36 x 36 inch footprint. Filled with water this tank carries roughly 2,710 pounds, and at its full 1.9 specific-gravity rating it can hold contents weighing up to about 5,150 pounds. That higher rating is the headroom that makes this a true batch and storage workhorse rather than a water-only drum. Run your volume through the Tank Sizing Calculator and the Tank Sizing Guide to confirm 325 gallons matches your draw-down and refill cycle before you commit to the 74-inch height.
What to get right before you order
The single most important number on this tank is the 1.9 specific-gravity rating against the natural white polyethylene wall. Specific gravity tells you how dense a liquid the tank is engineered to hold, and 1.9 is generous for an open top storage vessel, but it is a structural rating, not a chemical clearance. This is a water-class storage and batch tank, so use it for water, mixing, and bulk holding as listed. For any chemical service, confirm the resin and the OEM chemical-resistance chart first rather than assuming the high SG rating equals broad compatibility. Note also that this unit ships with no pre-installed fittings or bulkhead outlet, so plan for top-fill and top-draw or pump-out as you configure it. Because the top is open, plan for evaporation, debris, and overflow as well: an open vessel is not a sealed one, and tall narrow geometry means a small tilt translates into a real shift in surface level. See the technical drawing on this page for the full dimensional layout.
Mounting and support
At 74 inches tall and only 36 inches across, support the base on a flat, fully bearing surface and keep the tank plumb. A level concrete pad is the right foundation here, and it has to be rated for the loaded number: size the pad to the 5,150 lb maximum contents weight, not the 2,710 lb water figure, if you ever run dense solutions. Our guide on concrete pad sizing for above-ground polyethylene tanks walks through the framework, and if this tank feeds reuse or grey-water storage, the industrial water reuse topology guide covers storage-train integration.
This open top storage tank ships LTL freight from the nearest named plant, quoted live to your ZIP code so you see real delivery cost before you buy. Get your number with the Freight Cost Estimator, or call 866-418-1777 and we will help you size the tank, plan the pad, and lock in your delivery.
