How to Use


Hydrated Lime is manufactured for the stabilization of road surfaces, can also be used as a filler in asphalt to improve resistance to high temperature rutting.
Hydrated Lime is supplied to the water treatment industry for softening, pH adjustment/ coagulation and removal of impurities, and can also be used to remove acidic gases that are harmful to the environment particularly sulphur
dioxide and hydrogen chloride from flue gas.

Other names for hydrated lime: Slack Lime Calcium Hydrate Lime Hydrate Calcium Hydroxide Builders Lime Garden Lime.



Gardeners use lime to increase the pH of soils, making them more alkaline or sweet and less acidic or sour. Alkaline soil is typically found in dry climates, while acidic soil is associated with wet climates. Ground limestone — calcium carbonate sold in garden supply centers as garden lime — is most often used to adjust soil pH, but you can also use hydrated lime, or calcium hydroxide, which is more finely ground and more caustic.

Soil pHSoil pH is measured on a scale from 1 to 14. Soil below 7 is acidic. Soil above 7 is alkaline. Although a soil pH of 6.5 is the best level for most garden plants, the pH preferences vary by grass or plant species.Do not apply hydrated lime to your garden without testing the soil to find out how much pH adjustment is required for what you want to grow. You can buy a kit to test your soil pH at most garden supply centers.You can get a rough idea of your soil pH by adding a few drops of vinegar to dry soil in your garden. If it fizzes, the pH is greater than 7.5. You have alkaline soil and clearly no need to add lime. If your soil fizzes when you add a pinch of baking soda to moist garden soil, the pH is less than 5 and you may need to add lime.

Applying Hydrated Lime Hydrated lime is applied at two-thirds of the rate of garden lime. Winter is the ideal time to add hydrated lime for annuals planted in spring, although you can add it two weeks before planting. You can apply it one or two days before planting if necessary, but the soil pH will not change for several weeks. Spread the soil evenly throughout your garden then spade or plow it 6 inches deep. A spreader can be used to apply it.Add 11 4/5 ounces of hydrated lime per square yard of clay soil to raise the pH from 6 to 6.5. Add 19 2/3 ounces per square yard of 5.5 pH soil, 27 1/2 ounces to 5 pH soil and 35 1/3 ounces to 4.5 pH soil.Add 9 4/5 ounces of hydrated lime per square yard of loamy soil to raise the pH from 6 to 6.5. Add 15 2/3 ounces per square yard to 5.5 pH soil, 23 1/2 ounces to 5 pH soil and 29 1/2 ounces to 4.5 pH soil.Add 7 4/5 ounces of hydrated lime per square yard of sandy soil to raise the pH from 6 to 6.5. Add 13 2/3 ounce to 5.5 pH soil, 19 2/3 ounces to 5 pH soil and 25 1/2 ounces to 4.5 soil.Read more :



Hydrated Lime is vital to municipalities, as it is used for potable water softening PH, removal of heavy metals and impurities from drinking water. Further to this hydrated lime is a highly cost effective method for treating sewage sludge and animal waste from concentrated animal feeding operations.

Hydrated Lime has a number of benefits when used in water treatment:

  • Flocculation – removes course material by forming a fluffy charged solid that aids in removing smaller particles from water, leaving you with a clear pond after settlement.
  • PH correction – once Hydrated Lime is added to water it will raise the PH level neutralising any acids, this will help maintain healthy pipes.
  • Sterilisation – Hydrated Lime will actively kill bacteria and germs, which helps in the purification process.
  • Odour control – Once the PH level is increased and the germs killed off Hydrated Lime significantly reduce odours. (Great for offal pits and septic tanks).
  • Bio solid treatment – Lime is effective for speeding up the natural decomposition process, hugely effective for neutralising odours and drying back bio sludge material before disposal.

Hydrated Lime is not only used for municipal water treatment but is ideal for home and farm use in your farm ponds, effluent ponds, septic tanks and offal pits. Dosing with hydrated lime will reduce smell, correct PH, kill bacteria, speed up decomposition, absorb phosphates and heavy metals and kill algae.



Liming the lawn is a common practice among homeowners because lime helps to neutralize soil’s acidity and restore its nutrient balance. Also, turf grasses tend to grow best in alkaline soil, and lime is poisonous to many pests. Different kinds of lime are available, a fact important to know because of their varying toxicity. Agricultural lime is a very gentle, animal-friendly product, but hydrated lime is not. Also called calcium hydroxide and slaked lime, hydrated lime is highly caustic and can burn skin and eyes. It is used in cement and mortar, and it can kill a number of lawn-inhabiting parasites, such as fleas. Farmers often use it on outlying lands to protect animals from parasites that can sicken or kill them. Because hydrated lime’s use is restricted in some locations, check your area’s regulations before using the product.

  • Determine the best time to apply hydrated lime to your lawn. Because hydrated lime can burn leaves, liming in a dormant season is best. The West Virginia University Extension Service recommends liming in fall, with winter and early spring as the second and third choices, respectively. Plan to apply the lime on a day when the area will be dry and the weather will be calm instead of windy or breezy. Moist ground can cause an uneven application of hydrated lime, and wind will cause the caustic substance to blow haphazardly.
  • Cover your skin as much as possible by wearing a long-sleeved shirt, long pants, socks, closed-toe shoes made of a non-porous material, gloves, a dust mask and protective eye-wear. Do not inhale dust particles from the hydrated lime, and avoid all direct contact with that product.
  • Put hydrated lime in a drop spreader, and set the application level on the drop spreader so that no more than 20 pounds of hydrated lime will be applied per 1,000 square feet of lawn space. If you are unsure how much hydrated lime to use, use a lower amount because too much lime can kill grass.
  • Spread the hydrated lime over your lawn by using the drop spreader, beginning at the farthest corner of your yard and working toward your house or garage. Walk back and forth horizontally with the drop spreader until the entire area is covered with hydrated lime. Starting in the yard’s farthest corner prevents you from walking through the lime you just applied on the ground.
  • Water the entire lawn lightly using a garden hose. The water keeps the hydrated lime from blowing away and helps soil absorb it.Source:



Hydrated lime is caustic. Wear rubber gloves and goggles when applying it and do not inhale it.