why would you use this instead of just adjusting the fill height? thanks

You don't need this. One or two bricks work just as well for me. :)

With the three pack shown, are there 3 plastic clips to use in 3 different toilets

Yes there are 3 plastic clips..one for each toilet.

Are these mostly for older toilets? We have 1.6gpf toilets and I worry that if I order these and use them, there may not be enough flushing power.

I would be careful. You may just have to try it. The newer toilets are designed with the express goal of water conservation and probably make the most of each ounce of it. If your newer toilet is 1.6 gallons per flush, which is common, then this product would cut you flushing water in half, which may have a performance impact. If the toilet could work with half as much water, why didn’t they just design it that way? It doesn’t just depend on your toilet, it depends on the path the waste water takes through the pipes in your home. There must be enough pressure or water to coney all the stuff. The major driver for these products is old tank toilets that use 5 or 7 gallons per flush. Those could, in most cases, easily afford to cut out .8 gallons and still perform as needed. People with older toilets like that should definitely get a product like this.

Brand	W WINTHORPE PRODUCTS FOR THE PLANET
Model Number	B00YF84W16
Product Dimensions	30.48 x 19.05 x 3.81 cm; 141 g
Color	ブルー
Material	Plastic
Are Batteries Included	No
Item Weight	141 g

Toilet Tank Bank Water Saving Tank Insert - 3 Pack

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