Any DIY alternatives to PT Nuke?

[rge]

I think the main issue is silver coils are less prone to user error since nothing to mix.

On many aquarium sites, it is warned about the narrow range of copper... "For non-biological systems a continuous reading of 1.0 ppm is enough to assure effective algae control; more is superfluous and may damage finishes and equipment".
http://www.wetwebmedia.com/pondsubwebindex/cuusepds.htm

If you use distilled water and follow pt nuke instructions, you should be fine, and I aim for low side 0.5 ppm, and most use 0.3 to 0.5 in aquariums without issue. And if you put the correct concentration in, your simply mimicking what your loop is going to end up with in a month or so anyways from copper waterblocks.

But, I hear people using several drops per liter or more, which according to several aquarium sites (with decades of experience), risk issues with equipment.

I would be happy with either silver or copper, and would not expect problems with either, if both used correctly.