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Active Aqua Black Porthole Cover

$12.49 USD
  • 7.8 x 6.3 x 1.8 inch footprint fits all standard Active Aqua reservoir portholes.
  • Opaque black construction blocks light penetration to prevent algae formation.
  • Lightweight 0.24 lb design allows for instant manual access to the reservoir interior.
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THROUGH THE Cultivator's LENS Hands-On Evaluation

Who This Is For

  • You are sealing your reservoir because stray light entering the porthole is fueling unwanted algae growth in your feed.
  • You are capping open ports because you are tired of losing nutrient solution to evaporation during your grow cycle.

What We Found

  • The fit is snug enough to keep the reservoir dark, which is the only real way to stop algae from taking hold inside.
  • Lifting this cap is much faster than pulling the entire lid off when you just need to check your pH or nutrient levels.

What Users Say

  • Growers who switched to these say they noticed far less salt buildup around the porthole edges between cleanings.
  • Users report that their reservoir levels stay much more consistent since they stopped the constant evaporative loss.

Active Aqua Black Porthole Cover

While every Active Aqua reservoir cover ships with a built-in porthole opening — leaving that port open allows evaporation to increase, contaminants to enter freely, and the light-blocking benefit of the lid to be compromised. The Active Aqua Porthole Cover closes that gap with a purpose-fit black cap that seats directly into the porthole opening on any Active Aqua reservoir cover regardless of size. It lifts off quickly for routine maintenance like pH checks, nutrient additions, and probe adjustments, then drops back into place to reseal the reservoir between interactions.

Features

🔵
Universal Fit

Fits the porthole opening on all Active Aqua reservoir cover sizes — including the Active Aqua Premium White Reservoir Cover line.

💧
Reduces Evaporation

Sealing the porthole minimizes evaporative loss from the reservoir, helping maintain stable EC and pH levels between nutrient checks and reservoir top-offs.

🛡️
Blocks Contamination & Light

The black cover seals the porthole against airborne debris and blocks residual light that would otherwise pass through the open port and promote algae growth.

🔓
Quick-Access Design

Lifts off instantly for pH checks and nutrient additions — no tools required and no need to remove the lid of your Active Aqua 2.0 Black Reservoir to reach the solution.

Specifications

Specification Value
Compatibility All Active Aqua reservoir cover sizes
Color Black
Dimensions (L × W × H) 7.8" × 6.3" × 1.8"
Shipping Weight 0.24 lbs.

Frequently Asked Questions

Which Active Aqua reservoir covers is this porthole cover compatible with? +

The Active Aqua Porthole Cover is compatible with all Active Aqua reservoir cover sizes — including the Active Aqua Black Reservoir Cover - 50 Gallon and the Premium White Reservoir Cover line. A single porthole cover works across the entire lineup, so there's no need to match it to a specific size when ordering.

Why do I need a porthole cover if my reservoir lid already blocks light? +

An uncovered porthole opening is still a point of light entry, evaporation, and contamination — even on an otherwise fully covered reservoir. Without the porthole cover in place, light passes through the opening and can seed algae growth directly below the port, and airborne particles settle into the nutrient solution through the gap. The porthole cover completes the seal the reservoir lid starts.

Does the porthole cover stay in place securely during operation? +

Yes — the porthole cover seats into the opening on the reservoir lid and stays in place under normal operating conditions, including incidental contact and pump vibration. It's designed to be removed and replaced easily by hand without tools, so access remains quick while the cover holds its position reliably between maintenance intervals.

Can I run tubing or cables through the porthole while the cover is in place? +

The porthole cover is a solid cap designed to seal the opening when not in active use. For running permanent lines like pump cords, Active Aqua Black Vinyl Tubing, or probe cables, the main reservoir lid's drill access points are the recommended route — reserve the porthole for periodic manual access rather than continuous pass-throughs.

Does leaving the porthole uncovered significantly affect evaporation? +

Yes — even a small opening in a reservoir lid allows meaningful evaporative loss over time, particularly in warm grow rooms where air circulation is active. Evaporation concentrates the nutrient solution, gradually raising EC and shifting pH. In large setups like the 100 Gallon Active Aqua 2.0 Black Reservoir, even modest evaporation rates add up quickly across a grow cycle.

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