Can this be set as a 10 gallon sprayer?

You would need to know the ratio of product to gallons based on the chemical manufacturer's instructions. For example, 1 Tablespoon = 1 gallon. You would put 10 Tablespoons of product in the sprayer, fill the sprayer to the 10 gallon line and mix well before starting to spray. If you have any other questions about this sprayer that we can help with, please give our technical Customer Service Team a call at 800-950-4458 and they will be happy to assist you. Thank you for your question and for your interest in Chapin Sprayers.

what is the highest level of concentration? I would like to mix a 10-to1 ratio of water to bleach.

You might be better off with a sprayer that has a mixing dial. You cannot vary the mix on this sprayer.

So, if I'm using a product that calls for a ratio of 3 oz./gal., how much product do I put in this thing? I am math challenged, obviously :-(

A gallon is 128 ounces. A quart is 32 ounces. There are 4 quarts in a gallon. If you are saying your bottle sprayer is 32 ounces then I would presume you would need to divide the 3 oz by 4 which is 0.75 ounces. If you have a shot glass most shot glasses are Close to 1 ounce. So you would need to do a shot glass and fill it 3/4 of the way up with your product per usage. At least that is how I calculate it and what I would do.

Can this be used with granular fertilizer?

Hi. The Chapin G390: “Lawn Hose End Sprayer for Fertilizer” can be used with liquid or powder products. When using powders, be sure to mix the solution thoroughly before spraying to avoid clogging. If you have any further questions you can also reach our Technical Support team at 1-800-444-3140 option 1. Thank you for your question.

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Description

🌿 Spray Smarter, Not Harder — Your Lawn’s Best Kept Secret!

BUILT IN ANTI SIPHON SAFETY - Protect your water supply with advanced backflow prevention technology.
PRECISION FINGERTIP CONTROL - Instant on/off sprayer control for seamless application and zero waste.
UNIVERSAL HOSE COMPATIBILITY - Fits any standard garden hose with quick-connect options for fast nozzle swaps.
EFFORTLESS 20 GALLON COVERAGE - Spray large areas with a single tank fill—maximize your lawn care efficiency.
DURABLE CHEMICAL RESISTANT DESIGN - Rustproof polyethylene tank built to withstand harsh lawn chemicals season after season.

The Chapin G390 is a handheld, hose-end lawn sprayer featuring a 32-ounce chemical-resistant tank that mixes concentrate with water to spray up to 20 gallons per fill. Made in the USA with global materials, it offers fingertip on/off control, a universal hose fit with quick-connect compatibility, and a built-in anti-siphon valve to prevent backflow, ensuring safe, efficient, and durable lawn care.

Specifications

Color	multi
Size	20-Gallon
Style	Handheld
Material Type	Plastic
Number of Items	1
Power Source	Hand Powered
Tank Volume	32 Fluid Ounces
Included Components	Instruction Guide, Nozzle
Batteries Included?	No
Brand	CHAPIN
Manufacturer	Chapin International
Item model number	G390
Product Dimensions	13.97 x 21.08 x 10.41 cm; 136.08 g
ASIN	B00UER1SKK

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