CrystalClear Algae D-Solv Pond Algae Control, Fast-Acting EPA Registered Algaecide, Use in Fountains & Outdoor Ponds Containing Koi & Other Fish, Treats 5,760 Gallons, 16 Ounces

This was recommended to me to The Pond Guy. We had some extensive work done on our pond this past spring, and the people who did the work also said they’d clean our pond… they used a pressure washer. A real no-no, as the spray is too harsh and washes off all the ‘good algae’. A plain garden hose would have sufficed and been far better. Anyway, flash forward 8 weeks and I had the worst string algae ever. So thick… I used a stick to pull up globs every morning, and that didn’t touch the issue. It just got out of hand. Our pond is small – only 500 gallons. I used 1-1/2 ounces - first I cleaned a bucket very well, then dipped it into my pond and collected a bit of pond water. Then I added the Algae D-Solv to the pond water, swished to mix, and gently poured it into our pond. I repeated this every 3 day, for a total of 3 times. After the 3rd day of the 3rd treatment (12 days later), there was NO string algae. None. Of course, throughout the treatment I did have to clean the pond, the filter, and skimmer daily. Also, I have 2 falls, and added 4 bubblers while I treated the pond, for added aeration, which helps. Unfortunately, it left my pond very turbid. I couldn’t see the fish, or anything. Tried water changes – several. Added beneficial bacteria (unnecessary). No help. Finally ordered CrystalClear RapiClear Liquid Flocculent – one treatment did the job. After that, I occasionally treat the string algae, once, which does the trick, and several days later add the flocculent. I have comets and shubunkins, and because I know my pond’s correct volume, they were never harmed, nor were my water lilies, hyacinths, or other pond and bog plants. I also had a couple comet fry, and they are fine. Not a fan of adding anything to my pond. I'm a big believer in letting nature do it's thing. But sometimes the pond needs a bit of human intervention to keep it healthy. UPDATE: The weather has cooled off here, and this product does not work as well in cool/cold weather, BUT it does work - you need to give it time. My string algae started to return so I did 3 treatments, adding the D Solv every 3 days. After the 3rd treatment I just gave the pond a few extra days and sure enough, it's totally clear of string algae once again (average nighttime temps are in the low 50's and I've stopped feeding the fish, of course).

Works great

Easy to use... Not sure how effective it will be long term. Water is clear at this time.

this works as advertised. I live in north Florida and heat, sun and humidity makes algae grow very fast. I followed the instructions and within 48 hours I noticed less algae. I have read all the comments about dead fish and was at first skeptical of buying this. You must wait 3 days before treating again. This is noted in the instructions. Ido have fish in my small pond and they are all alive and well. Great product.

I have struggled with green water for 7 years. Without a lengthy history, I bought this product in May of this year. I followed the directions perfectly and it cleared the water without any real issues to the fish the first month. The aeration is superb. There, I am above reproach. Also, I have never lost a koi. These fish know me and I care for them. I will admit when I poured CrystalClear into the water, the fish would go into a very still state for about a day, and they would not eat but sluggishly come back to movement by 48 hours. That was OK with me because the water started to clear. Well, in June I followed the same direction and the fish started to swim erratically within an hour. I could see the distress. I instantly started moving the water out but lost 9 koi out of 27. A third! They just went belly up within hours, even with a frantic water change from a 210 foot deep well (no chemicals) and similar temp. We are heart-broken, of course. Pretty mad too as i go through the stages of grief. Stupidly, I thought "Can't be the product", so I tried once more at half-strength and BOOM, the fish went sick. Drained again. That stuff has no place in water with fish. I am very sad and poorer. Find another product, people. I can see that there are other koi people that had a similar experience, and it's not good to have something that can turn on you and your loved ones so fast. It is a deadly product.

Wow! is what I say about this product. It works really good. The before and after pictures in the product advertisement were what made me purchase this brand. But didn’t know if it was true or not so what the heck I’ll try it. And boy was it right? My outdoor pond looks so clean like no other time before. I wished I would have taken a picture before I put this in but ugh. It literally took minutes for it to clear up from green to absolutely clear. Can see all the way to the bottom. Great product.

Doesn’t work pond or aquarium took more severe measures and ordered pumps with uv lights

My husband and I weren’t sure what to do with our outdoor fountain. it wasn’t practical to keep cleaning it every week and we were looking for a water treatment issue that wasn’t going to harm any of the creatures that drink from it. We tried this stuff and it works great no more icky looking water. Just pure clear flowing water.