EcoBio-Block Natural Volcanic Rock for Aquarium Water Clarity & Balance — Low-Maintenance Alternative to Weekly Additives — for Freshwater Fish, Turtles, Shrimp & Frogs (Small, 8-16 gal)

Price: $18.89
(as of Jun 13, 2026 09:49:11 UTC – Details)
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Customer Reviews

4.2 out of 5 stars 4,215

4.2 out of 5 stars 4,215

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4.2 out of 5 stars 4,215

4.2 out of 5 stars 4,215

4.2 out of 5 stars 4,215

Price

$11.50$11.50 $15.46$15.46
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$18.89$18.89 $27.93$27.93 $52.00$52.00

Dimensions (in.):
1.125 x 1.125 x 1.125 1.125 x 1.125 x 1.125, each 2.5 x 2.5 x 1.0 2.5 x 2.5 x 2.0 3.75 x 3.75 x 2.125 3.75 x 3.75 x 2.125, each

Tank capacity (gal.):
0.8–1.5 Gal. 1.6-3 Gal. Total 3–8 Gal. 8–16 Gal. 15–40 Gal. 30-60 Gal. Total

Weight (lb.):
0.1 0.1, each 0.22 0.5 1.2 1.2, each

Available in a 2 pack

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Is Discontinued By Manufacturer ‏ : ‎ No
Product Dimensions ‏ : ‎ 2.38 x 2.88 x 4.38 inches; 6 ounces
Item model number ‏ : ‎ EBSSC00106
Date First Available ‏ : ‎ June 17, 2010
Manufacturer ‏ : ‎ ONEdersave Products LLC
ASIN ‏ : ‎ B003SOO4XY
Best Sellers Rank: #12,043 in Pet Supplies (See Top 100 in Pet Supplies) #88 in Aquarium Water Treatments
Customer Reviews: 4.2 4.2 out of 5 stars (4,215) var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
MORE THAN A ROCK, NOT JUST FILTER MEDIA — engineered with mineral-rich, porous natural volcanic rock, nutrients, and a neutralizing cement binder; the structure absorbs pollutants and stabilizes water chemistry, actively maintaining a stable, healthy tank environment rather than sitting passively like standard filter media
SKIP THE WEEKLY DOSING, LASTS UP TO 2 YEARS — one stone replaces liquid water treatments, clarifiers, and bottled additives for up to 2 years; no droppers, no measuring, no weekly schedule, no recurring costs — just drop it in and let your tank stabilize itself
SIMPLE 3-STEP SETUP, RESULTS IN 2–6 WEEKS — rinse in chlorine-free water, soak overnight in chlorine-free water, then place near your filter outlet or air stone so water circulates through it; most tanks show results in 2–6 weeks, some as fast as 2 days, with slightly cloudy water during the first week being normal as your tank settles in
SAFE FOR ALL FRESHWATER FISH & AQUATIC LIFE — safe for delicate fish, turtles, shrimp, and frogs; ideal for starting a new tank, clearing cloudy water, reducing water changes, and eliminating odors; check pH and standard water test parameters during the first few weeks as conditions settle, and do a partial water change if anything drifts too far
SMALL SIZE TREATS 8–16 GALLONS — sized for 10- and 15-gallon community tanks, planted aquascapes, and small freshwater setups; also available in Nano (0.8–1.5 gal), Nano 2-Pack, Mini (3–8 gal), Medium (15–40 gal), and Medium 2-Pack; for heavily stocked tanks, poor starting conditions, or tanks near the upper end of the range, choose the next size up or add a second stone for faster, stronger results