Water is the most popular liquid ballast because it is cheap and plentiful. If you have a lot of tractor tires to fill or want to save money, water is probably your best option. Avoid using water in weather with temperatures below 32F (0C), as your liquid ballast may freeze and weigh down the tire. In cold, wintery climates, antifreeze can keep your ballast from freezing. Mix water with antifreeze in a 50/50 ratio to prevent your ballast from weighing down your tractor when temperatures drop. Choose non-toxic antifreeze in case your ballast leaks and comes in contact with plants or animals. Antifreeze can keep liquid ballast from solidifying in temperatures down to 40F (40C). Calcium chloride is the best liquid ballast for climates where temperatures drop as low as 50F (46C). Mix calcium chloride flakes with water in a ratio suggested by its packaging for a cheap, freeze-resistant ballast solution. Calcium chloride is, however, more likely to rust the metal parts of tractor tires. Polyurethane foam is a common liquid ballast with a sturdy weight. Because you have to hire a mechanic to fill the tires, however, it is pricier than most ballast options. Do not attempt to fill tires with polyurethane foam yourself, as it will be more likely to leak while your tractor moves.
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One-sentence summary -- Use water for the most inexpensive ballast option. Fill your tires with diluted antifreeze in cold weather. Try calcium chloride ballast in extreme cold temperatures. Choose polyurethane foam for an effective, yet expensive ballast option.

Put the baking soda in a small a bowl and stir in a little bit of water. The consistency should be a thick paste. If the mixture is too thick, add a little more water to thin it out. If you put too much water and the mixture is too thin, add a little more baking soda to thicken it. Dip a bottle brush into the paste, making sure to coat the bristles heavily. Use the brush to scrub the inside of your flask. Target areas that are badly stained by using small, circular motions. Repeat this step as needed. It may take a few goings over to completely remove the stain, so don't worry if the stain doesn't come out on the first go. Fill your flask with warm tap water. Use the bottle brush along the insides of the flask to loosen up the baking soda paste. Swirl the water around the bottle a few times and then pour it out. Try filling the bottle up about halfway with water, putting on the lid, and gently shaking the bottle up and down. Pour the water out and run fresh water into the bottle. The agitation will help clear out excess residue. Once there is no baking soda residue remaining on the inside of the flask, continue to run the warm water into the flask, swirl it around, then pour it out. Repeat this step 2 or 3 times, or until the water runs clear. Place the bottle in a dish drying rack, or try propping it an angle against your kitchen wall or the side of the sink. Just make sure it has proper air circulation to prevent bacteria from growing. To help with timing, try washing your Hydro Flask in the evening to allow it to dry overnight and be ready to use the next day.
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One-sentence summary -- Mix 2-3 tbsp (30-45g) of baking soda with warm water to form a paste. Scrub the inside of your Hydro Flask with the paste. Rinse your Hydro Flask thoroughly with warm water. Dry your Hydro Flask by allowing it to sit upside down.

. Frogs are especially susceptible to poisoning from pesticides, herbicides, synthetic fertilizers, and other common garden chemicals because their hydration and respiration takes place through their porous skin. If you want to attract a healthy frog population, start by using organic gardening practices. Instead of using synthetic fertilizer, encourage growth through picking nutrient-rich soils that are appropriate to each plant, rotating your crops to keep your soil rich, and using organic fertilizer when necessary. Keep in mind that once you've attracted frogs, you shouldn't have any need of chemical pesticides since a single frog will consume more than 10,000 bugs a season. You want to attract the right kind of frogs. Non-native frogs will compete with local ones for food and shelter. Sometimes they'll even eat local species. Their populations are also generally difficult to control because they have no natural predators. Identify the species of frogs in your yard or garden to be sure that they're not invasive. Invasive.org has a list of dangerous non-native wildlife that can be searched by animal type and region. If you do find invasive species of frogs in your yard or garden, contact your local government environmental agency, like your state's DNR, or a nonprofit conservation group, like the National Wildlife Federation, for advice and support about how to remove them responsibly. Frogs like to hide in tall grass and are frequent victims of lawn mowers. Be sure that you can see any rogue amphibians in your path by keeping the grass in your yard or garden well-trimmed. Most male frogs hibernate in water over the winter. A thin layer of ice will not harm them. However, if their water source is completely frozen, they won't survive. Protect any dormant amphibians by putting a pan of hot water over thickening ice. Many flowers and vegetables are poisonous to frogs. Protect the amphibian population in your yard or garden by either not planting species that are toxic to them or by planting them well away from your intended frog habitat. Vegetables that are dangerous for frogs include eggplant, rhubarb, snow peas, and potatoes. Flowers that are toxic to frogs include honeysuckle, azaleas, hydrangeas, daffodils, and hyacinth.
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One-sentence summary --
Avoid using chemicals Keep out invasive species. Keep your grass short. Thaw water sources when necessary. Avoid plants that are toxic to frogs.