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GR Hydro
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15 followers
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Grand Rapids Hydroponics has Clearex is stock and we sell it for less or lunch is on us.Use Clearex to correct the most common cause of crop failure - the buildup of nutrient salt deposits in soils or soilless grow media. High salt concentrations in media can cause the shrinkage and death of plant cells due to the excess draw of water through cell walls, and eventually lead to the irreversible wilting of plant leaves and stems. Periodic flushs with Clearex will remove excess nutrient salts and safely leach them from your crops media.
Clearex can also be used at the end of a crop’s growth cycle to trigger the last reproductive stage of the plant forcing it to process and assimilate internally stored nutrients. Pre-harvest treatments with Clearex can enhance flavors and increase yields in fruits, vegetables, and culinary herbs encouraging plants to process these excess nutrients.
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Over sixty skids of ProMix gone and the best prices on it East of the Mississippi or lunch is on us.
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Typical HPS lamps provide a very limited HPS spectrum, but HORTILUX’s HPS light specifications include sufficient violet, blue, and green light to make them a true multitasker.
Our high pressure sodium grow lamps outshine the competition.
Grand Rapids Hydroponics sells them for less or lunch is on us.
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Sometimes you need a Rock. Grand Rapids Hydroponics has Rock Fusion and we sell it for less or lunch is on us.
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Grand rapids Hydroponics sells more M3 than all those high priced boys combined and we sell it for less. 616-454-2500.
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Beginning with select ingredients and formulated by a team of professional horticulturists, Sunshine® Advanced #4 Growing Mix is recommended for indoor growing. OMRI listed for organic gardening, this myco-active mix it retains moisture while providing improved root aeration and drainage to develop strong, healthy root systems for maximum stem, flower and foliar growth. Grand Rapids Hydroponics guarantees the best price on Sunshine # 4 or lunch is on us. 616-454-2500. 
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This revolutionary dimmable electronic ballast is a premiere choice for your indoor garden. The UltraGROW ES-EB1000/W mini ballast operates 1000-watt metal halide or high pressure sodium lamps, and uses cutting edge circuit board technology to make it half the size of traditional ballasts at a quarter of the weight. Compared to magnetic ballasts, this electronic ballast features up to a 30 percent energy savings, runs 20 percent cooler than other digital ballasts on the market, and allows you to customize your light output between 50, 75, and 100 percent. Pre-wired with a dual lamp receptacle, this electronic ballast allows you to use all commmon reflectors without an adapter plug. Enhance your indoor garden with the UltraGROW ES-EB1000/W digital ballast today! Grand Rapids Hydropoincs sells them for less. 616-454-2500.
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The Autopilot Greenhouse Master Controller (GMC) is designed to precisely control temperature, humidity, and CO2 in the growing area.

The GMC's enclosure features four separate power outlets used to connect external devices such as fans, CO2 injectors, air conditioners and dehumidifiers. Each external device easily connects to the unit creating a simple and user friendly platform.

The GMC's fan-powered remote combination probe features a highly accurate dual beam CO2 sensor. The remote sensor can be placed up to 15 feet from the controller and has been designed to resist EMI / EFI from electronic ballasts.

Each unit has been pre-programmed with factory recommended settings for quick plug and play operation. Autopilot controllers offer grow room guidance.

• Precise temperature, humidity and CO2 control
• Controls up to 4 devices 
• Separate day/night temperature set-points
• LED error indicators
• Remote 15' sensor for temperature, humidity, and CO2

Grand Rapids Hydroponics sells them for less 616-454-2500.
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Buy any one item in the store today and get a chance at getting another one for FREE! Pick a card any card. Call it and we'll double it for FREE!

Those high priced boys would never do this. The best prices are always at Grand Rapids Hydroponics Inc.
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