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Black plastic reservoir cover with grid pattern and square cutout, isolated on white.

Active Aqua Black Reservoir Cover - 50 Gallon

Official Active Aqua Dealer Model: HGRES50C
$69.99 USD$59.99 USD$69.99 USD
 $69.99 USD
starting from 0% interest financing from /mo.

Payment Options

Options:Pay in Four, Pay Monthly
Amount:Up to $1,500 (Pay in 4)
Up to $10,000 (Monthly)
Schedule:Bi-weekly to Monthly
Term:6 weeks, 12 or 24 months
Interest:0% to 35.99% APR*
Credit Check?Soft Check Only
Schedule:Bi-weekly to Monthly
Term:6 weeks, 6 or 12 months
Interest:0% to 35.99% APR*
Credit Check?Soft Check Only
Finance up to:$4,000
Must apply on a desktop device.
Schedule:Flexible
Term:Up to 36 months
Interest:Processing fee + interest
Lease-to-Own?Yes
Amount:$500 to $10,000
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  • Covers a 36.5 inch by 36.5 inch area to seal 50-gallon reservoirs.
  • Ribbed ABS plastic construction prevents sagging under ambient humidity.
  • Low 2-inch profile fits easily beneath tiered systems and flood tables.
  • View More Details

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THROUGH THE Cultivator's LENS Hands-On Evaluation

Who This Is For

  • You are adding a dedicated reservoir cover because your current open setup allows algae to bloom in the feed solution.
  • You are sealing your nutrient reservoir because rising humidity levels in the grow room indicate too much evaporation.

What We Found

  • The convex shape works well because it forces water runoff back inside rather than letting it puddle on top.
  • We like the ABS plastic because it handles grow room heat without showing any signs of warping over time.

What Users Say

  • Users who added this cover say they spend less time dialing in their pH because the nutrient levels stay stable.
  • Buyers with automated setups report that the porthole makes running lines for pumps and sensors much cleaner.

Active Aqua Black Reservoir Cover - 50 Gallon

An open reservoir in a grow room is a liability — light reaches the nutrient solution and drives algae growth, evaporation throws off EC and pH between checks, and airborne debris settles directly into your feed water. The Active Aqua 50 Gallon Black Reservoir Cover closes that gap with a purpose-built lid sized at 36.5" × 36.5" for the Active Aqua 50-gallon reservoir. Made from durable, UV-resistant high-impact ABS plastic, it holds up under the sustained heat and humidity of active grow environments without warping or degrading over time.

The slightly convex, ribbed surface profile keeps the cover rigid across its full span while directing any water that collects on top back toward the edges and into the reservoir — eliminating pooling without any intervention. A built-in access porthole lets you run pumps, black vinyl tubing, and probes without removing the cover, and the low-profile 2" height keeps clearance requirements minimal under flood tables and tiered systems. Note that the porthole cover is sold separately.

Features

🧱
UV-Resistant ABS Plastic

High-impact ABS plastic with UV resistance holds up under sustained grow room heat and humidity without warping, cracking, or degrading over time.

💧
Convex Self-Draining Profile

The slightly convex ribbed design channels any water that collects on top back into the reservoir rather than allowing it to pool or spill onto surrounding surfaces.

🔵
Built-In Access Porthole

Integrated porthole provides access for pumps, tubing, and monitoring probes without removing the cover. A compatible porthole cover is available separately.

📏
Low-Profile 2" Height

At just 2" tall, the cover fits under flood tables and tiered hydroponic systems with minimal clearance requirements, keeping your setup compact and accessible.

💪
Ribbed Structural Design

Ribbed surface construction reinforces rigidity across the full 36.5" × 36.5" span, preventing flex or sag under weight without adding unnecessary bulk.

🧹
Rounded Corners for Easy Cleaning

Rounded corner geometry eliminates the hard-to-reach angles that trap debris and mineral buildup, making routine cleaning faster and more thorough between reservoir cycles.

Specifications

Specification Value
Compatible Reservoir Active Aqua 50 Gallon Reservoir
Cover Dimensions (L × W × H) 36.5" × 36.5" × 2.0"
Material High-impact ABS plastic, UV-resistant
Color Black
Porthole Cover Sold separately
Shipping Weight 2.4 lbs.

Frequently Asked Questions

Will this cover fit my Active Aqua 50-gallon reservoir? +

This cover is sized at 36.5" × 36.5" specifically for the Active Aqua 50-gallon reservoir. If you are using a larger container like the Active Aqua 100 Gallon Reservoir or a different brand, compare your reservoir's opening dimensions against the cover measurements before ordering to confirm compatibility.

Is the porthole cover included? +

No — the porthole cover is sold separately. The built-in porthole opening is present on the cover and ready to accept the porthole cover once purchased. The Active Aqua porthole cover is universally compatible across the Active Aqua reservoir cover lineup.

What is the difference between this cover and the Active Aqua Premium White Reservoir Cover? +

This cover is made from high-impact ABS plastic and is designed for the Active Aqua standard reservoir lineup in black. The Active Aqua Premium White Reservoir Cover is made from a different material, comes in white, and is sized for a different set of Active Aqua reservoirs. Both share the convex ribbed design and porthole feature.

Does covering my reservoir actually help with algae control? +

Yes — light is the primary driver of algae growth in hydroponic reservoirs. The black ABS cover blocks light from reaching the nutrient solution entirely, removing the key condition algae needs to establish. Combined with regular reservoir maintenance, a properly fitted cover is one of the most effective and low-cost algae prevention measures available.

Can this cover support weight placed on top of it? +

The ribbed ABS construction provides meaningful rigidity across the 36.5" span, but this cover is not designed as a structural platform for heavy equipment. It handles incidental contact and light loads without issue, but placing significant weight on top risks flexing or cracking the cover over time.

How do I run pump cords and tubing through this cover? +

The cover's built-in porthole is the primary access point for pumps, tubing, and probe cables. For additional pass-throughs, the ABS material can be drilled using a standard hole saw or titanium step drill bit — size the hole to match your fitting or rubber grommet for a clean, sealed penetration.

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Questions About This Product?

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