FRP Rectangular Graywater Holding Tank Supplier in the Philippines

An FRP rectangular graywater holding tank is a bolted panel fiberglass reinforced plastic tank built in a cuboid shape rather than the cylindrical profile most people picture when they hear water tank. The panels bolt together on site into a box-shaped shell, the same modular construction JOHOB Hardware Trading uses for its FRP and GRP panel water tanks, just assembled to a rectangular footprint instead of a round one. The tank holds graywater, meaning reclaimed wash, rinse, or condensate water that is not potable but is still clean enough to reuse for irrigation, flushing, or cooling tower makeup, after it leaves a laundry, kitchen, or process line and before it goes to a treatment step or a reuse line. JOHOB supplies these tanks nationwide across the Philippines through TankSmith, its sister brand for water storage turnkey installs, and sources the panels from an ISO 9001 certified partner factory. The panels themselves are WRAS-certified and TUV SUD tested, and CE marking applies where the installation includes electrical components such as level controls or transfer pumps. Because the shell is bolted rather than molded as one piece, a rectangular FRP tank can go into spaces a cylindrical tank cannot, which matters most for graywater systems retrofitted into an existing basement, utility room, or rooftop plant deck.

Most graywater holding tanks get added after a building is already built, which means the tank has to fit the space that is left over rather than the other way around. A rectangular or cuboid FRP tank uses a fixed footprint more efficiently than a cylindrical tank of the same material, since there is no wasted curved corner space, which is the main reason rectangular configurations get specified for tight basements, narrow utility yards, and rooftop plant decks common on Metro Manila and other dense Philippine commercial sites. The bolted panel construction also means the tank is modular: additional panels can be added to extend length or height within the same footprint if a facility's graywater volume grows, without replacing the tank outright. FRP and GRP are also a practical material choice for graywater specifically, not just for shape, because the resin surface resists the mild corrosivity of detergent residue, lint, and the slight acidity or alkalinity swings typical of reclaimed wash and rinse water better than bare steel. That combination, a rectangular footprint plus a corrosion-resistant panel material, is why JOHOB's existing product and guide content already points laundry, hotel, and hospital buyers toward FRP or GRP when the conversation turns to a reuse collection tank rather than a potable storage tank.

Because the tank is built from bolted panels rather than cast as a single piece, capacity is not fixed to a catalog number. A rectangular FRP graywater holding tank is sized by adding panel rows and courses to match the measured or estimated graywater flow from the source, whether that is a laundry's rinse cycle, a kitchen's pot-wash line, or a cooling tower bleed-off, so JOHOB quotes capacity per site rather than publishing a one-size list. What stays constant across sizes is the ordering timeline: standard lead time is 21 to 35 days for stock configurations and 45 to 90 days for made-to-order panel counts or non-standard dimensions, and JOHOB responds to a request for quote within 1 business day. Pricing is quote-based rather than publicly listed, since the panel count, access requirements, and any pumping or level-control package bundled with the tank all move the final number. For buyers operating inside a PEZA, SBMA, or Clark freeport zone, or exporters, the order qualifies for zero-VAT treatment instead of the standard 12 percent VAT that applies to VAT-registered buyers outside those zones. Procurement teams working to a fixed commissioning date should raise the made-to-order lead time early, since a non-standard rectangular footprint is the configuration most likely to fall outside the 21 to 35 day ex-stock window.

Storing and reusing graywater in the Philippines sits under plumbing and building code provisions rather than a single graywater-specific regulation, so the tank itself is only one part of a compliant installation. The National Plumbing Code of the Philippines (NSPC) governs how a non-potable reuse line has to be kept physically separate from the potable supply, including separate piping, labeling, and backflow protection, and the National Building Code (NBC) governs the structural loading for wherever the tank sits, which matters specifically for rooftop or elevated plant deck placements where a filled rectangular FRP tank adds meaningful dead load to the structure. JOHOB supplies the tank, the panel structure, and where specified the pumping and control package that moves water into and out of it, engineered to the site's stated capacity and loading requirements. Confirming that the full installation, piping separation, backflow devices, and any local water district or LGU sign-off, meets code is the responsibility of the buyer's engineer of record, since that sign-off depends on the specific building, water district, and use case rather than the tank supplier. Buyers should loop in their plumbing or MEP consultant before finalizing tank placement so the structural and piping-separation requirements are priced into the project at the same time as the tank itself, not discovered after it arrives.

The FRP panels used in JOHOB's rectangular graywater holding tanks are WRAS-certified and TUV SUD tested, and the partner factory that produces them operates under an ISO 9001 quality management system. CE marking applies to any electrical component bundled into the system, such as duplex transfer pumps, level controls, or a VFD panel, and ASME standards apply where a pressure vessel is part of the package rather than to the holding tank shell itself. JOHOB delivers nationwide across the Philippines, covering the National Capital Region, Luzon, Visayas, and Mindanao, as well as PEZA, SBMA, and Clark freeport locations. Commercial terms are quote-based: there is no published price list, VAT-registered buyers outside a freeport zone pay the standard 12 percent VAT, and PEZA, SBMA, and exporter accounts qualify for zero-VAT invoicing. Standard lead time runs 21 to 35 days for ex-stock panel configurations and 45 to 90 days for made-to-order sizing, and every request for quote gets a response within 1 business day. JOHOB supplies and delivers the tank and equipment package; the civil and plumbing installation works stay with the buyer's own contractor of record.

The buyers who specify a rectangular FRP graywater holding tank over a standard cylindrical potable tank are almost always reacting to a specific reuse case rather than shopping by tank type first. Commercial laundries use one to hold reclaimed rinse water before it goes back into a wash cycle or out to irrigation. Hotels and hospitals use one as part of a broader water efficiency push, typically paired with the same booster or transfer pumping JOHOB already supplies for potable systems. Food and beverage facilities use one to hold process rinse water that is not potable but is still too clean to send straight to drain. SBMA and PEZA locators often specify the rectangular configuration specifically because their plant layouts are already tight and a cylindrical tank would not fit the allocated utility footprint. In every one of these cases, the tank is one piece of a larger reuse system, not a standalone purchase, which is why JOHOB's water storage line connects directly to its pumping, VFD panel, and piping categories rather than being sold in isolation. Buyers evaluating this configuration should bring their measured or estimated graywater flow rate and their available footprint to the first conversation, since both determine the panel count and the lead time quote more than any other input.